What system of the human body benefits directly from the action of microorganisms?

A. Cardiovascular

B. Digestive

C. Respiratory

D. Urinary

Which of the following molecules starts to break down by enzymes in saliva and continues to break down in the small intestine by enzymes from the pancreas? a. Lipids b. Starch c. Proteins d. Amino acids e. Fatty acids

Phosphorescence is a phenomenon associated with what algal division?

Light waves travel and strike a mirror. If the angle of incidence is 30°, what is the angle of reflection? 30° 180° 150° 60°

Explain why a food web is a better representation of energy flow in a community than a food chain.

When continental plates pull apart at a spreading on land of what form?

A plant species live in an area with limited sunlight

Which statement is true of the nucleus of a cell

Until about 200 million years ago, Earth's continents were joined as a single land mass called A. Asia Minor. B. Pangaea. C. Glossopteris. D. Cynognathus.

How many cells does a fish have? Do they maintain homeostasis?

What types of reproductive isolation may have been important in galápagos finch speciation? a. geographic isolation and temporal isolation b. geographic isolation and behavioral isolation c. behavioral isolation and temporal isolation d.