The first barrier to invasion is
a. antibody production.
b. intact skin and body cavity linings.
c. direct attack by white blood cells.
d. innate immunity.
e. development of memory cells.
B
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Which group of organisms will break down the wastes and remains within the community and convert them into inorganic building blocks?
a. Decomposers b. Secondary producers c. Primary consumers d. Detritivores e. Primary producers
If there are 10,000 calories of net primary productivity in a field, how much, on average, will be available to a secondary consumer?
A. 100 calories B. 1 calorie C. 10 calories D. 10,000 calories E. 1,000 calories
This protein requires iron as a cofactor.
a. Keratin b. Hemoglobin c. Actin d. Insulin e. Pepsin
Blood pressure is lowest in ________
A) veins B) capillaries C) arterioles D) venules