An example of a salt-wedge estuary is:
a. the Mississippi Delta.
b. Delaware Bay.
c. Chesapeake Bay.
d. Puget Sound.
A
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Which of the following are the water conducting cells of the xylem?
A. tracheids and parenchyma B. vessels and parenchyma C. sieve tubes and tracheids D. vessels and tracheids E. parenchyma and sieve tubes
According to the diversity-stability hypothesis:
A. Genetic diversity is the most important part of ecosystem stability. B. A loss of any species from an ecosystem leads to an approximately equal decline in stability. C. The loss of a few species from an ecosystem does significantly affect ecosystem functioning. D. Losing even a few species from an ecosystem causes a drastic decline in ecosystem stability. E. Every species has an important role in ecosystem function, but we cannot predict the effect of species loss.
What slowed down the decomposition rate of the oil spilled from the Exxon Valdez?
a. Cold temperatures b. Rugged terrain c. Suffocation of bacteria d. Slow currents
How do fungi typically reproduce?
A. by spores B. by fruits C. by rhizomes D. by seeds