What has occurred to bring about this specialtion?
A storm blows a small group of migrating birds off course and they land on an island too far from the mainland for them to fly back on course. The birds remain on the island for 100 generations when a second storm blows more birds from the mainland to the island. The new birds cannot mate with the established birds, even though they are originally from the same population.
A. Genetic drift.
B. Doubling of chromosome number in the mainland birds.
C. Geographical isolation resulting in reproductive isolation.
D. Development of a reproductive isolating mechanism dealing with sperm count.
E. All of these.
C. Geographical isolation resulting in reproductive isolation.
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Crab spiders can be found sitting on top of flowers in fields. They are easily visible on warm
sunny days. This is an example of an organism’s __________.
a. microhabitat b. macrohabitat c. niche d. life zone
Which of the following defines the benthic realm?
a. The area of the ocean that is considered open water. b. The area of the ocean into which no light can penetrate. c. The area that extends along the ocean bottom along the shoreline to the deepest parts of the ocean floor. d. The area of the ocean between high and low tide that is the oceanic region closest to land.
The site of fertilization is labeled
a. 1. b. 2. c. 3. d. 4. e. 5.
Refer to the accompanying figure. Which of the fruits listed is botanically classified as a berry?
a. c
b. d
c. f
d. g
e. h