"Net primary productivity" is
A. the amount of energy used in metabolism by producers.
B. the amount of energy given off as heat by producers.
C. the amount of energy trapped by the autotrophs of an ecosystem.
D. the amount of energy available for consumers.
E. the amount of energy used in metabolism by consumers.
Answer: D. the amount of energy available for consumers.
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In humans, variations in skin color are due to differences in the amount, type, and distribution of the pigment ____________________
Fill in the blank(s) with correct word
Blood has many functions in the human body. For example, it
A. is a liquid connective tissue. B. delivers food to the cells of the body. C. delivers oxygen to the cells of the body. D. helps remove wastes from the body. E. All of the answer choices are correct.
All of the following pertain to cephalosporins, except
A. many are administered by injection, not orally. B. they have a beta-lactam ring. C. newer generations have activity against gram-negative bacteria. D. they have greater resistance to beta-lactamases. E. they are are synthetic drugs.
What is attached to the plastron and may be involved in respiration?
What will be an ideal response?