grade 5 midterm Classera homework

A nonnative animal that moves into a new place ________________.

• Invasive

• extinction

• Beaver

• algae

Organisms that cause red tide when present in large numbers _____________

• Invasive

• extinction

• Beaver

• algae

_______________happened to dodo birds and Tasmanian wolves.

• Invasive

• extinction

• Beaver

• algae

_________________. An animal that can be helpful or harmful, depending on point of view.

• Invasive

• extinction

• Beaver

• algae

A gradual buildup of organisms in an environment that consists of bare rock is called _________succession.

• primary

• drought

• pollution

• conservation

___________________occurs when no rain falls for a long period of time.

• primary

• drought

• pollution

• conservation

Protecting ecosystems and the organism living in them____________________                          

• primary

• drought

• pollution

• conservation

An ecosystem is made of both biotic and abiotic things. Which describes the biotic part of the ecosystem?

• plant that grows in soil

• the animals that breathe oxygen

• all living things in the environment

• plants and animals that live in water.

If you stand in the middle of an open field, you are standing among individual organisms, different species, populations, and communities. What makes up one of the populations in the field?

• all organisms of the same species

• the different communities in the ecosystem

• the communities that occupy the same niche

• all organisms that live in a certain part of the field

The rainforests in South America support many ecosystems. These ecosystems are healthy. How does the diversity in the rainforests help determine the health of ecosystems?

• When diversity is high, there are more resources available.

• Resources in the environment last longer when the diversity is low

• Less diverse ecosystems have less competition among the residents

• Areas with high diversity have increased competition among the residents.