All living things need nitrogen. How does nitrogen enter the living portion of an ecosystem?
A. Atmospheric N2 taken in by soil bacteria
B. Elemental nitrogen taken in by plant leaves
C. Elemental nitrogen taken in by plant roots
D. Atmospheric N2 taken in by photosynthesis
Answer: A
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Comparing one person from Europe with one person from Africa would show a greater amount of variation than comparing two people from New Zealand
A. true B. false
The carrying capacity of white-tailed deer in a certain habitat is 10 deer/km2. The deer population is presently 5 deer/ km2. Which of the following predictions is most likely for this deer population?
a. A population decrease. b. A population increase. c. A population that will remain at 5 deer/ km2. d. A population that will reach 30 deer/ km2 and then experience a crash. e. A population that will be controlled by intrinsic regulating mechanisms.
Exocrine glands secrete all of the following except
a. enzymes. b. sweat. c. milk. d. saliva. e. hormones.