How are atoms held together in molecules? A. They combine to form polymers
B. They form covalent bonds
C. They break hydrogen bonds
D. they form ions

What kind of action is a cause of air pollution

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.