This is the process of gradual, natural change and species replacement that takes place in communities of an ecosystem over time.

A Starfish live in saltwater ecosystems. Some species live in shallow tidal pools, while others live in the deepest parts of the oceans. This a description of the ____________ of starfish

True or False: The biome the Tundra is extremely cold and dry.

True or False: The grassland is extremely cold and dry.

A large variety of plants grows in tropical rain forest because ____________.

An organism's particular role in its habitat, or how it makes its living, is called its ___________.

The Escherichia coli that live in your intestine and help break down food are an example of which type of interaction?

An organism's habitat must provide all of the following EXCEPT ______________.

When a flea is living on a dog, the dog is the ____________.

True or False: Symbiotic relationships are Mutualism, commensalism, and parasitism.

True or False: A hawk building its nest on an arm of a saguaro cactus is an example of mutualism.

The series of changes that occurs after a disturbance in an existing ecosystem is called _____________.

The first species to populate an area where primary succession is taking place are called _______________.

Both the alga and the fungus are benefited from their relationship in a lichen. This relationship is one of ______________.

True or False: Bacteria and fungi are known as decomposers because they break down the remains of organisms.

The soil that is frozen all year in the tundra is called _________________.

All of the following are limiting factors EXCEPT.

Which of the following is a biotic factor in the desert ecosystem?

The place where an organism lives and that provides the things the organism needs is called its ____________.