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[ "a telescope is used for observing stars by astronomers", "Black holes are formed by the collapse of massive stars." ]
Astronomers use telescopes to study black holes.
True
[ "a telescope is used for observing stars by astronomers", "Magnification A telescope is an optical system." ]
an optical system is used for observing stars by astronomers
True
[ "a telescope is used for observing stars by astronomers", "And, of course, the Sun is a star." ]
a telescope is used for observing the sun
True
[ "a telescope is used for observing stars by astronomers", "Telescopes are the tools of the astronomers to study the unverse." ]
Astronomers study the stars and universe
True
[ "a telescope is used for observing stars by astronomers", "If such a star is spinning, it is called a pulsar." ]
A telescope is used for observing a pulsar.
True
[ "a telescope is used for observing stars by astronomers", "People who study the sky and stars are called astronomers." ]
Telescopes are used to study the stars.
True
[ "a telescope is used for observing stars by astronomers", "Astronomers locate stars by reference to the constellations." ]
Astronomers observe constellations with telecopes.
True
[ "a telescope is used for observing stars by astronomers", "Telescopes have detected planets orbiting nearby stars." ]
Astronomers use telescopes to detect planets
True
[ "a telescope is used for observing stars by astronomers", "Telescopes A telescope needs at least two lenses." ]
at least two lenses are used for observing stars by astronomers
True
[ "mineral graphite is used for making pencil lead", "Graphite for writing pencils is composed of carbon." ]
carbon is a component of pencil lead
True
[ "mineral graphite is used for making pencil lead", "Pencil graphite is black." ]
Pencil lead is from a black mineral.
True
[ "mineral graphite is used for making pencil lead", "Diamond and graphite are made of carbon." ]
A mineral made of carbon is used for making pencil lead.
True
[ "mineral graphite is used for making pencil lead", "Mineral graphite, the softest mineral, is actually the lead in pencils." ]
The softest mineral is used for making pencil lead
True
[ "mineral graphite is used for making pencil lead", "Carbon exists as a free mineral in graphite and diamond." ]
carbon is in pencil lead
True
[ "mineral graphite is used for making pencil lead", "Pencil lead is a mixture of graphite and clay." ]
Mineral graphite and clay are mixed together for a safe alternative to lead.
True
[ "mineral graphite is used for making pencil lead", "Graphite pencils are familiar to students." ]
students use pencils
True
[ "hiding can be used for avoiding predators", "Predators kill and eat their prey." ]
hiding helps prey avoid being eaten
True
[ "hiding can be used for avoiding predators", "Animals hide under rocks for protection." ]
Going under rocks can be used by animals to avoid predators
True
[ "hiding can be used for avoiding predators", "Camouflage and hiding help animals escape hungry predators." ]
camouflauge can be used to avoid predators
True
[ "hiding can be used for avoiding predators", "Animals hide by using camouflage." ]
Camouflage is used for avoiding predators.
True
[ "hiding can be used for avoiding predators", "Predation is the best documented cause of early mortality, particularly for mobile species." ]
hiding can be used for avoiding early mortality
True
[ "hiding can be used for avoiding predators", "By avoiding outside weather extremes, the unit's life span is expanded." ]
Hiding from predators can expand life spans.
True
[ "hiding can be used for avoiding predators", "Many people are still in hiding in caves and river beds." ]
Caves can be used to avoid predators.
True
[ "hiding can be used for avoiding predators", "All sharks are predators." ]
hiding can be used for avoiding sharks
True
[ "hiding can be used for avoiding predators", "And even without predators, survival is still tough for the moose." ]
Hiding can be used for survival
True
[ "hiding can be used for avoiding predators", "Lots of insects use camouflage to hide from predators." ]
Camouflage helps insects avoid predators.
True
[ "hiding can be used for avoiding predators", "Some animals are camouflaged to hide." ]
Some animals use camouflage to avoid predators?
True
[ "hiding can be used for avoiding predators", "When a carnivore or omnivore eats an animal, it is the predator." ]
Hiding can be used for avoiding carnivores or omnivores
True
[ "hiding can be used for avoiding predators", "Predators Gulls are chief predators of eggs or young birds." ]
hiding can be used by animals like young birds
True
[ "hiding can be used for avoiding predators", "Some animals are camouflaged to hide." ]
camouflage can be used to avoid predators
True
[ "hiding can be used for avoiding predators", "By staying away the rest of the time, they avoid drawing predators' attention to their young." ]
hiding can be used for staying away from predators.
True
[ "hiding can be used for avoiding predators", "Eagles and people are predators of the rattlesnake." ]
rattlesnakes can hide to avoid eagles
True
[ "Placental mammals are the dominant land mammals.", "Humans are placental mammals." ]
humans are the dominant land mammals
True
[ "Placental mammals are the dominant land mammals.", "Placental Mammals Placental mammals have wombs." ]
animals with wombs are dominant
True
[ "Placental mammals are the dominant land mammals.", "Land animals get oxygen from the air." ]
Placental mammals get oxygen from the air.
True
[ "Placental mammals are the dominant land mammals.", "African elephants are the largest land mammal." ]
The African elephant is a placental mammal.
True
[ "Placental mammals are the dominant land mammals.", "Humans are also placental mammals." ]
Humans are the dominant land mammals
True
[ "Placental mammals are the dominant land mammals.", "Placental Mammals Placental mammals have wombs." ]
the dominant land mammals have wombs.
True
[ "Placental mammals are the dominant land mammals.", "African Elephants are the largest land mammals." ]
elephants have a placenta
True
[ "Placental mammals are the dominant land mammals.", "Humans are placental mammals." ]
Humans are the dominant land mammals.
True
[ "Placental mammals are the dominant land mammals.", "Marine mammals Marine mammals are related to land mammals." ]
Placental mammals are related to marine mammals.
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Children can plant sunflower seeds." ]
sunflowers can wait to germinate until conditions are favorable for growth
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Light increases germination." ]
Many seeds wait for increased light conditions to grow.
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Many factors favor growth." ]
Seeds wait to germinate until factors favor growth
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Light is necessary for germination." ]
Light is favorable for a seed's growth.
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Most seeds germinate in spring when conditions become favorable." ]
Many seeds wait to germinate in spring.
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Germination is when a seed sprouts." ]
Many seeds can wait to sprout until conditions are favorable for growth.
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Seed fail to germinate or seed germinate and the roots decay." ]
Roots will decay is the conditions for growth aren't favorable.
True
[ "Many seeds can wait to germinate until conditions are favorable for growth.", "Light increases germination." ]
Seed wait to grow for favorable conditions which increase growth like light
True
[ "living underground can be used for hiding from predators", "Marmots live in underground burrows." ]
Living in burrows can be used to hide from predators
True
[ "living underground can be used for hiding from predators", "Coyotes (predators) eat rabbits (prey)." ]
If rabbits live underground, they can hide from coyotes.
True
[ "living underground can be used for hiding from predators", "Moles and gophers spend their lives underground." ]
moles and gophers spend their lives hiding from predators
True
[ "living underground can be used for hiding from predators", "Habitats often provide animals with camouflage, or places to hide from predators or prey." ]
Some animals have underground habitats.
True
[ "living underground can be used for hiding from predators", "The color of the egg helps to hide it from predators." ]
Color and going underground helps conceal from predators
True
[ "living underground can be used for hiding from predators", "The land predators are primarily rat snakes, raccoons, and opossums." ]
living underground can be used for hiding from rat snakes, raccoons, and opossums
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "If there is one animal that symbolizes the Ice Age, it is the Woolly Mammoth." ]
mammoths lived when the planet was buried in snow and ice for millions of years at a time
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Of all the animals that lived during the Ice Age, the Woolly Mammoth is best known." ]
The Woolly Mammoth lived when the planet was buried in snow and ice.
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Ice Ages are rare in geologic history." ]
it's rare in geologic history when the planet gets buried in snow and ice
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Ice Age Ice ages occur during times known as glacial epochs." ]
When the planet was buried in snow and ice it was known as the glacial epochs
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Unmelted winter snow and ice accumulate from year to year, and an ice age can begin." ]
Unmelted winter snow and ice buried the planet
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Ice Age Ice ages occur during times known as glacial epochs." ]
ice ages are also known as glacial epochs
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Earth is our home planet." ]
ice ages buried Earth in snow and ice for millions of years at a time
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "By far and away the biggest climate changes are ice ages." ]
climate change can bury the planet in snow
True
[ "Ice ages buried the planet in snow and ice for millions of years at a time.", "Ice ages or glacial ages are relatively rare to the planet." ]
the planet being buried in snow and ice for millions of years at a time is relatively rare
True
[ "camouflage is used for protection by prey against predators", "Many insects use camouflage." ]
insects can protect against predators
True
[ "camouflage is used for protection by prey against predators", "Many species blend in, or camouflage, with their surroundings." ]
Blending in with surroundings is used for protection by prey against predators.
True
[ "camouflage is used for protection by prey against predators", "Cryptic coloration is a type of camouflage." ]
Cryptic coloration is used for protection by prey against predators
True
[ "camouflage is used for protection by prey against predators", "Color camouflage helps amphibians avoid predation." ]
amphibians use color for protection
True
[ "camouflage is used for protection by prey against predators", "Many animals camouflage or protect themselves by blending into their surroundings." ]
Animals protect themselves from predators by blending in with their surroundings
True
[ "camouflage is used for protection by prey against predators", "Desert lizards are usually camouflaged ." ]
desert lizards are protected from predators because they can't be seen
True
[ "camouflage is used for protection by prey against predators", "Animals hide by using camouflage." ]
Prey animals hide for protection against predators.
True
[ "camouflage is used for protection by prey against predators", "Owls are their natural enemy and predator." ]
Camouflage is used for protection by prey against enemies.
True
[ "camouflage is used for protection by prey against predators", "Some butterflies use their colors as camouflage." ]
Some butterflies can use their colors as protection from predators
True
[ "camouflage is used for protection by prey against predators", "Most crustaceans camouflage themselves by changing color to match the environment." ]
Crustaceans change color to protect themselves against predators.
True
[ "camouflage is used for protection by prey against predators", "Eagles and people are predators of the rattlesnake." ]
camouflage is used for protection by rattlesnakes against eagles
True
[ "camouflage is used for protection by prey against predators", "Spiders use camouflage to blend in with colors and patterns." ]
blending with colors and patterns is used for protection by prey against predators
True
[ "camouflage is used for protection by prey against predators", "Camouflage helps disguise an animal so that it is less visable to preditors or prey." ]
camouflage is used for protection and helps disguise an animal
True
[ "eating prey requires catching prey", "Because they usually hunt for large animals, the wolves work together to catch their prey." ]
animals hunt prey in order to eat
True
[ "eating prey requires catching prey", "Predators are the animals that eat prey." ]
Being a predator requires catching prey.
True
[ "eating prey requires catching prey", "Spiders prey upon insects." ]
Spiders catch insects.
True
[ "eating prey requires catching prey", "Animals that survive by catching prey or escaping predators have special adaptations for running." ]
predators eat prey
True
[ "eating prey requires catching prey", "Rodents and rabbits are their main prey." ]
eating rabbits requires catching rabbits
True
[ "eating prey requires catching prey", "Owls eat small prey." ]
Owls catch small creatures to eat
True
[ "eating prey requires catching prey", "Crab spiders catch their prey by ambush." ]
crab spiders eat by ambushing
True
[ "Scientists who find and study fossils are called paleontologists.", "Paleontologist study the fossils of dinosuars." ]
Scientists who find and study dinosaurs are called paleontologists
True
[ "Scientists who find and study fossils are called paleontologists.", "Great creatures become old bones, then fossils, covered in mud by unremarkable tides." ]
Scientists who find and study old bones are called palentologists.
True
[ "Scientists who find and study fossils are called paleontologists.", "Fossilization is the process that turns a once living thing into a fossil." ]
Scientists who study the process that preserves a once living thing are called paleontologists
True
[ "Scientists who find and study fossils are called paleontologists.", "Paleontologists study ancient life." ]
Fossils are remnants of ancient life.
True
[ "Scientists who find and study fossils are called paleontologists.", "Paleontologist study the fossils of dinosuars." ]
scientists study dinosaur fossils
True
[ "Scientists who find and study fossils are called paleontologists.", "Earth scientists study fossils." ]
Paleontologists are earth scientists.
True
[ "Scientists who find and study fossils are called paleontologists.", "Dinosaur bones, preserved as fossils, help tell their fascinating story." ]
paleontologists study dinosaur bones
True
[ "Caffeine is an example of a psychoactive drug.", "Psychoactive drugs alter neurotransmitters in the brain." ]
Caffeine alters neurotransmitters in the brain.
True
[ "Caffeine is an example of a psychoactive drug.", "Psychoactive drugs alter neurotransmitters in the brain." ]
Caffeine alters neurotransmitters in the brain
True
[ "Caffeine is an example of a psychoactive drug.", "Because caffeine is a psychoactive, addictive drug." ]
caffeine is psychoactive
True
[ "Caffeine is an example of a psychoactive drug.", "Caffeine is a drug that can be addictive." ]
a drug that can be addictive is an example of a psychoactive drug
True
[ "Caffeine is an example of a psychoactive drug.", "Because caffeine is a psychoactive, addictive drug." ]
caffeine is an addictive drug
True
[ "Caffeine is an example of a psychoactive drug.", "Caffeine, found in coffee and caffeinated soft drinks, is a diuretic." ]
coffee contains psychoactive drugs
True
[ "Caffeine is an example of a psychoactive drug.", "Coffee is an excellent source of caffeine." ]
coffee contains a psychoactive drug
True
[ "Caffeine is an example of a psychoactive drug.", "Psychoactive drugs alter neurotransmitters in the brain." ]
Caffeine alter neurotransmitters in the brain.
True
[ "Caffeine is an example of a psychoactive drug.", "Any psychoactive drug is potentially harmful." ]
Caffeine is potentially harmful.
True