Due to changes in their musculature, which vessels can vary the resistance to blood flow?
a. arteries
b. veins
c. capillaries
d. arterioles
e. venules.
D
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The fossil record represents _____ of the total species that have ever lived
1.90% 2.less than 1% 3.75% 4.50% 5.5%
The way in which an organism utilizes its environment may be called
A. resource partitioning. B. its habitat. C. competitive exclusion. D. intraspecific competition. E. its niche.
Which of the following statements about the late follicular phase in the female reproductive cycle is false?
a) The rise in estrogen inhibits the release of GnRH, LH, and FSH b) The follicle responds to LH because of the presence of FSH induced LH receptors c) Takes place during the proliferative phase of the uterine cycle d) The follicle ruptures at the end of the late follicular phase e) Both a and c are false.
If 25 individuals of a total population of 50 have the AA genotype and 10 have the Aa genotype, what is the frequency of the "a" allele?
A. 0.5 B. 0.3 C. 0.4 D. 0.6