The food web models a community along the coast of Alaska. Which organism in the food web is an herbivore?
A Sea otter
B. Phytoplankton
C. Seagull
D. Rock ptarmigan

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

What kind of bond is created by the attraction between atomic particles of opposite charge? ionic bond hydrogen bond covalent bond nuclear bond