Closer observation reveals that these small spheres are produced on tiny extensions of the stem, each of which helps compose the strobilus. These small, spore-producing extensions of the stem are called
A) scales
B) sporangia
C) sporophylls
D) gametangia
Ans: C) sporophylls
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Blood vessels that connect networks of capillary beds are
(a) arteries. (b) veins. (c) portal veins. (d) both b and c.
Learned behavior
(a) has a learning component. (b) has a genetic component. (c) has no genetic component. (d) has both a and b.
Which of the following statements concerning glial cells is true?
a. Astrocytes are phagocytic cells that remove debris in the central nervous system. b. Schwann cells form sheaths around neurons within the central nervous system. c. Oligodendrocytes regulate the concentration of neurotransmitters in neurons. d. Microglia are involved in the neurological disease multiple sclerosis. e. Ependymal cells help produce and circulate cerebrospinal fluid.
Convert 0.75 mg to g.
A. 0.075 B. 75 C. 0.00075 D. 7.5