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cutting down trees in a forest causes the number of trees to decrease in that forest
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a tree is a source of shelter / food for birds / animals in an ecosystem
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an animal requires a habitat for survival
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cutting down trees in a forest causes the number of trees to decrease in that forest
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a tree is a kind of habitat
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a beach is a kind of environment
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an animal requires a habitat for survival
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a sea turtle is a kind of animal
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if animals lose the thing they require to survive, their population will decrease
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sea turtle is a native species to the beach
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humans moving in an environment usually causes native species to lose their habitats
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humans changing ecosystems usually has a negative impact on an ecosystem / organisms living in an ecosystem
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humans building homes in an ecosystem causes that ecosystem to change
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a wetland is a kind of ecosystem
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a snowshoe hare is a kind of animal
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snowshoe hare lives in the field
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housing developments are build in a field
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building housing developments usually requires replacing animal habitats
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if the habitat of an animal is replaced, then that animal will not be found in that place
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pesticides can cause pollution
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fertilizers are a source of pollution
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electric cars use electricity as the main energy source
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regular cars use gasoline as an energy source
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electricity causes less pollution than gasoline
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a pollutions standard is a kind of standard for reducing pollutants emitted by vehicles
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many vehicles emit pollution into the air
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a vehicle inspection is when a person examines a vehicle for pollution standards
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as the use of public transportation increases , the use of automobiles decreases
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bus is a kind of public transportation
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the use of automobiles causes pollution to the environment
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coal is a kind of fossil fuel
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oil is a kind of fossil fuel
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sulfur dioxide is a kind of gas
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burning fossil fuels releases sulfur dioxide into the atmosphere
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sulfur dioxide dissolving in water causes acid rain
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burning gasoline is a source of air pollution
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gas-efficient engines uses less gasoline
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using gasoline requires burning gasoline
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an engine is a part of an automobile
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emitting sulfur dioxide causes acid rain
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sulfur scrubbers can reduce the emission of sulfur dioxide
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a body of water is a kind of environment
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humans discarding waste in an environment causes harm to that environment
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discarding is similar to throwing
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a stream is a kind of moving body of water
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garbage means waste
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a mountain chorus frog is a kind of animal
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polluting means something poisonous is added to an environment
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pollutions in animals habitat can cause the population of animals to decrease
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bodies of water are the habitats for aquatic animals
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a body of water is a kind of environment
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a frog is a kind of aquatic animal
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a mountain chorus frog is a kind of frog
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offshore oil platforms might cause oil to leak into the water
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oil is a kind of pollutant
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water is a part of an environment
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water pollution is when humans pollute the environment with pollutants
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a lake is a kind of body of water
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a lawn is a piece of land covered with grass
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fertilizers have a positive impact on algae growth
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algae is found in bodies of water
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lori uses fertilizer on her lawn
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runoff flows across land and ends in bodies of water
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if fertilizer is used on a land, then the runoff from that land will contain fertilizer
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ocean pollution can decrease the number of phytoplanktons and algae
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phytoplankton is a kind of plant
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plants are a source of oxygen through photosynthesis
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algae is found in bodies of water
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phytoplanktons are found in bodies of water
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algae is a kind of plant
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an ocean is a kind of body of water
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as the amount of a source of something decreases , the amount of that something will decrease
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commercial harvesting from the ocean has caused populations of large predatory fish to decrease
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tuna is a kind of fish
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tuna eat fish
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if an animal eats other animals for food , then the animal is the predator
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a rhinoceros is a kind of animal
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decreasing in population will cause the population to be low
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endangered means low in population
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overhunting decreases animal populations
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killing a living thing decreases the population of that living thing
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hunting is when a human kills an animal for food / recreation in the wild
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an animal is a kind of living thing
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an animal is a kind of organism
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if a population decreases to zero then that organism is extinct
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an organism becoming extinct causes a change in the organism 's food web
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a change in a food web can cause damage to an ecosystem
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recycling decreases the amount of waste sent to landfills
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aluminum is recyclable
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recyclable means a material can be recycled / reused many times
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an aluminum can is a kind of object
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recyclable means a material can be recycled / reused many times
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aluminum cans are made of aluminum
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aluminum is recyclable
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an example of recycling is using an object to make a new object
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aluminum is recyclable
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an aluminum can is made of aluminum
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recycling resources has a positive impact on the conservation of those resources
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metal is a kind of natural resource
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aluminum cans are made of aluminum
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