to return something to how it was before
to restore
the system of all the living things in an environment, and the way they connect with each other
an ecosystem
no longer existing (of an animal or plant)
extinct
the natural home of an animal or plant
a habitat
to become well and healthy again after an injury or illness
to heal
the land along the sides of a river
a riverbank
to slowly be reduced or disappear
to erode
an animal that kills and eats other animals
a predator
solid waste from a person or animal
excrement
to communicate a message to a lot of people
to spread the word
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