Blood vessels that return blood from capillaries back to the heart are
a. arteries.
b. veins.
c. portal veins.
d. arterioles.
a
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Which structure, A, B, C, or D, serves as the site where the embryo and fetus will attach, receive nourishment, and grow?
1.A
2.B
3.C
4.D
The associated figure provides support for which of the following processes?
a. secondary succession
b. competitive exclusion
c. coevolution
d. mutualism
e. resource partitioning
The location of specific genes
A.) cannot be determined with current biological methods. B.) has only rarely been determined. C.) can be mapped to specific spots on chromosomes. D.) has been found only for humans.
Which of the following contribute to the environmental resistance of bacterial endospores?
A. Low water content of endospore B. Spore coat C. Lower pH D. Presence of calcium dipicolinate E. All of the choices are correct.