Put the following stages of primary succession in the proper order
A. bushes appear
B. ferns and grasses become established
C. glaciers retreat
D. lichens erode rocks
E. mosses appear
F. soil is present
G. trees are established
1. first event
2. second event
3. third event
4. fourth event
5. fifth event
6. sixth event
7. seventh event
ANS:1.
C
2. D
3. F
4. E
5. B
6. A
7. G
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If you tracked an individual X chromosome from a male to his first generation offspring, then to his second generation offspring, what pattern would you see?
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a. requires that only one parent be a carrier. b. displays its symptoms in heterozygotes. c. is more frequent in males than females. d. requires that both parents are carriers. e. only affects females.
The first successful land plants, even though they lacked vascular tissue, were the
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