A ____ is a body of water.
river
Something that is ____ is bad.
negative
A rainforest and a desert are different _________.
ecosystems
A ____ is a contest or struggle between two or more people or animals.
competition
_____ are things that you can use. A library has many _____.
resources
If the bears eat too many fish it will affect the ________.
food chain
In a ______, the water level goes down.
drought
_____ means things like rivers, trees, and animals. She likes to study ____.
nature
Something that is _____ is good.
positive
He filled his cup to the highest ______ of coffee.
level