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an asteroid is a kind of object
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a disruption of an ecosystem can cause an extinction
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a disruption is a kind of change
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an impact can mean the result of two objects forcibly colliding
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if a habitat can no longer support animals then those animals will move to another area
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cutting down trees in a forest causes the number of trees to decrease in that forest
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if something is destroyed then that something no longer exists
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a deer lives in a forest
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cutting down a forest means cutting down trees in a forest
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if a habitat is removed then that habitat is destroyed
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if an animal 's habitat no longer exists then that animal will die
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a deer is a kind of animal
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animals live in their habitat
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if the state of a habitat causes animals in that habitat to die then that habitat can not support animals
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a shelter is used for living in by animals
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decreasing the number of trees in a forest is a kind of method for removing a forest
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an aquatic animal requires great amounts of water to thrive
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if a species of animal is able to thrive in an environment, then the population of that animal will increase
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if an organism requires something to perform a process, then increasing that something increases that organism's ability to perform that process
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floods are a source of water
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an otter is a kind of aquatic animal
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when a body of water receives more water than it can hold , a flood occurs
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an aquatic animal is a kind of organism
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as the amount of rainfall increases in an area , the amount of available water in that area will increase
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wildfire is when a forest catches fire
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harming an organism can cause that organism to die
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a wildfire is a kind of natural disaster
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a wildfire can mean a forest fire
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an animal is a kind of organism
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fire causes harm to organisms
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natural disasters can cause animals to leave an environment
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an adaptation has a positive impact on a living thing 's survival
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drier means lower in amount of water
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living things require water for survival
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if something increases something else then that something has a positive impact on that something else
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storing water increases the water available to organisms in a dry environment
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a dry environment is low in availability of water
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an aquatic animal is a kind of animal
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drought is when available water decreases in an environment
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aquatic animals live in bodies of water
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causing an animal to die has a negative effect on that animal
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if a body of water loses all water then that body of water does not exist any more
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a pond is a kind of body of water
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if an animal 's habitat no longer exists then that animal will die
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a frog is a kind of animal
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a frog is a kind of aquatic animal
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changes to abiotic factors in an environment affect biotic factors in that environment
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a decrease is a kind of change
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living things require water for survival
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organisms compete for resources in an environment
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a consumer is a kind of living thing
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organisms are biotic factors of an environment
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natural resources can be abiotic factors of an environment
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a living thing is an organism
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drought is when available water decreases in an environment
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water is a kind of natural resource
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an alligator is a kind of animal
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alligators eat frogs / turtles / fish / mice / birds
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an animal is a kind of organism
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competition may cause animals to act aggressively towards members of their own species
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a predator eats other animals for food
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as the population of prey decreases , competition between predators will increase
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a species means a group of a certain kind of organism
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frogs / turtles / fish / mice / birds are kinds of animals
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a plant is a kind of organism
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rainfall is the amount of rain an area receives
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as the available water in an environment increases , the populations of organisms in that environment will increase
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rain is a source of water
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plants of the same species have the same type of seed
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an organism 's environment affects that organism 's acquired characteristics
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species is an inherited characteristic
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a plant is a kind of organism
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inherited characteristics are the opposite of acquired characteristics
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moisture is a form of water
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plants require water for survival
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a lack of something that a living thing requires prevents the survival of that living thing
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a desert environment is low in availability of water
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a plant is a kind of living thing
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a drought occurs over a period of months / years
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a marsh willow herb is a kind of plant
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drought is when available water decreases in an environment
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as available water decreases , the population of plants will decrease
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if an organism requires something then that something is a resource for that organism
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clouds can block sunlight
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a plant is a kind of organism
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different plants require different amounts of certain resources to grow / survive
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precipitation is a property of weather
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a plant requires photosynthesis to grow / survive
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climate is a property of environment
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temperature is a property of weather
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precipitation is water that falls to the ground from clouds
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a plants require water for survival / to grow
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if something is a property of something else then that something else determines that something
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a plant requires sunlight to perform photosynthesis
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climate is the usual kind of weather in a location over a period of time
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a hole is a kind of opening
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a tree requires sunlight to grow
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light can travel through an opening
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a tree falling in a forest creates a hole in a forest canopy
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if a living thing dies then the resources used by that living thing will become available
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