Scientists observing coral-reef communities have noted declines in coral reefs in regions that have both agricultural runoff and rising water temperatures. What are the possible reasons for these observations?
What will be an ideal response?
Agricultural runoff may cause eutrophication, which reduces both light penetration and oxygen due to excess algal production. High water temperatures may encourage explosions of algal populations, which may release specific toxins. In addition, coral reefs expel the symbiotic algae when waters become too warm, thus cutting off the food source for the corals.
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What proportion of the (F2 generation) offspring of a dihybrid cross is expected to be recessive for both traits?
a. 3/16 b. 9/16 c. 1/16 d. 0
Many rural communities object to nearby wilderness designations because they
A. depend on natural resources in the area. B. dislike and misunderstand wildlife. C. object to subsidies for wildlife. D. dislike having wilderness nearby. E. object to all of the campers and hikers who visit the area.
On Figure 37-3, the part of the embryo that contains most of the food used by the embryonic plant during germination is labeled:
a. 2.
b. 3.
c. 4.
d. 5.
e. 6.
Human characteristics did not evolve all at one time.
Answer the following statement true (T) or false (F)