How does DDT in the environment affect many birds?
A. chronic liver failure in adults
B. stunted growth of chicks
C. neurological degeneration
D. decreased reproductive rate
Answer: D
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After the drought of 1977, researchers on the island of Daphne Major hypothesized that medium ground finches that had large, deep beaks, survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoid
es fruits. If this hypothesis is correct, what would you expect to observe if a population of these medium ground finches colonizes a nearby island where Tribulus cistoides is the most abundant food for the next 1000 years? Assume that (1) even the survivors of the 1977 drought sometimes had difficulty cracking the tough T. cistoides fruits and would eat other seeds when offered a choice; and (2) food availability is the primary limit on finch fitness on this new island. A) evolution of yet larger, deeper beaks over time B) evolution of smaller, pointier beaks over time C) random fluctuations in beak size and shape D) no change in beak size and shape
The vertebral column develops from
a. the notochord. b. the hollow, dorsal nerve cord. c. the gill slits. d. the tail. e. more than one of these
Most flowering plants maximize their ability to take up nutrients by taking part in mutualisms with fungi. These
mutualisms are called ____.
a. root nodules b. Rhizobium c. mycorrhizae d. legumes e. endodermal associations
All other factors being equal, the renaturation of the three classes of complementary nucleic acid sequences occurs in what order, from fastest to slowest?
What will be an ideal response?