When the community in an ecosystem changes over time, the process is known as ___________.

When people use resources wisey,they are practicing ______.

The United States government helped in the _____ of ecosystems by setting aside national parks.

If a hurricane were to destroy the habitat for plants along the coast,new plants would grow. This process is called________

As plants and animals die in a marsh,their remains add to the marsh's______

A new aluminium can made from used cans is an example of______

This is an example of of water conservation

Damage can result to nearby water ecosystems if factory pipes carrying ______ leak into a stream.

The movement of bits of rock or soil by wind and water is called ______

The natural process of breaking down rock is ______

Soil that is ______ is capable of growing a lot of plants.

____________ means saving of soil.

All the populations that live in the same place make up a ______

An organism's role in its_____,or home is called its _______.

A group of parts that work as a unit is called a ____.

A bear is an example of a _____, or an animal that eats plants or other animals.

Coral reefs are affected by the ______, or saltiness,of ocean water.

_____ is reached when the changes in a s system are balanced.

A carrot plant is an example of a _____, one of the levels in a food chain.

Populations and the environment in which they interact form an ____.

All the coral polyps living in a reef form a ____ of polyps.

Rain forests and coral reefs are important because they have great variety,or _____, of living things.

A fungus is an example of a ______, the last level in a food chain.

__________ is the avarage weather over a long time.

For an insect,the space under a rock is likely its ________

A rain forest and all the animals that live there are_____

Robins,earthworms, and grass live in a yard. These groups make up a _______.,

Which of these are consumers in a coral reef ecosystem?

Groups of livint things and their enviroment make up______