Which of the following terms best fit with the
theory of uniformity?
a. gradual
b. catastrophic
c. abrupt
d. extinction
e. more than one of these
A
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Although we must be cautious about oversimplifying, when visible traits are markedly different among human races, a likely explanation is that the differences have been favored by:
A. natural selection and/or sexual selection. B. diversifying selection and/or stabilizing selection. C. allopatric speciation and/or sexual selection. D. disruptive selection and/or natural selection. E. sympatric selection and/or sexual selection.
Archaeopteris, the first known tree, had what characteristics?
_____ It occurred in forests. _____ It possessed wood. _____ It reproduced by seeds. _____ It had a eustele. _____ It had a vascular cambium.
The specialized male gametophyte of seed plants, such as gymnosperms, is called a(n) ____
a. sporopollenin b. ovule c. seed d. strobilus e. pollen grain
Which of the following is NOT an application
of cladistic analysis?
a. determining the extent of genetic diversity within a population b. conservation of species c. viral pathways between unrelated species d. the causes of extinction events e. all of these are applications of cladistic analysis