Plants need which molecules to carry out photosynthesis?
a. H2O only
b. CO2 only
c. O2 only
d. both CO2 and O2
e. both CO2 and H2O
e
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What is the biggest threat to the species in the Klamath-Siskiyou forest of southwestern Oregon and northwestern California? a. Logging of the forest
b. Degradation of the streams by pollution. c. Periodic fires that sweep through, burning thousands of acres. d. Development of the region for urban expansion. e. None of these choices.
Mammals are least likely to be _____
a. mutualists c. brood parasites b. commensal d. predators
The term ________ refers to the presence of small numbers of bacteria in the blood.
A. septicemia B. viremia C. toxemia D. bacteremia
Which chemical released by white blood cells causes arterioles to dilate?
a. cytokines b. histamine c. interferons d. complement e. interleukins