All of the following are included in the modern concept of a biological species EXCEPT
a. genetic compatibility
b. viable offspring
c. fertile offspring
d. gene flow inhibition
e. reproductive compatibility
Ans: d. gene flow inhibition
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Tight junctions between muscle cells help muscle tissue function as a unit
Indicate whether the statement is true or false.
Figure 55-1 represents:
a. a fairly simple food web.
b. a fairly simple food chain.
c. a pyramid of biomass.
d. a pyramid of energy.
e. a pyramid of numbers.
Which of these factors stimulates the juxtaglomerular apparatus to produce renin?
A. sudden decreases in blood pressure B. concentration of sodium ions in the blood is too low C. concentration of potassium ions in the blood is too high D. both sudden decreases in blood pressure and concentration of sodium ions in the blood is too low. E. All of these conditions increase renin secretion.
The effects of elevated atmospheric CO2 concentrations
A. have the potential to alter the nutritional status of plants. B. allow the plant to use O2 more efficiently in photosynthesis. C. have the potential to allow herbivores to eat less plant matter. D. cause an increase in rubisco production. E. have no effect on nutrient levels found in plant leaves.