Wich two organ systems work together to inhale oxygen?

Sustainable development requires that we use natural resources without using them up or harming the environment. It involves sensible use of land, air, water, plants, and animals.

What distinguishes a hypothesis from a theory? A. A theory is a scientific explanation. B. A theory is testable. C. A theory explains a natural phenomenon. D. A theory is backed up by repeated observations and tests.

In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, which are eaten by fish, which are then eaten by ducks. In this system, the greatest amount of biomass would be found in the

Decomposers consume nonliving organic matter.

Scientists can determine the direction a glacier traveled by examining: drumlins striations erratics two of the above

A collection of the same kinds of organisms is called an a) ecosystem b) habitat c) population d) environment e) community

Which of the following would you classify as something other than an animal? A) sponges B) coral C) jellyfish D) choanoflagellates

Flowering plants are classified as

What is the role of trna in protein synthesis?

Which of the following is an example of a natural resource? a. water b. ice c. oxygen d. all of the above