How does urban sprawl directly or indirectly affect human health?
A. Traffic and congestion during a long commute increases air pollution.
B. More time in the car means less time to exercise (i.e. walk or bike).
C. Many children now grow up without the experience of roaming through woods and fields; this is known as Nature Deficit Disorder.
D. All of the above are correct.
E. Urban sprawl has absolutely no effect on human health. No studies have ever been done to examine this.
Ans: D. All of the above are correct.
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Sponges are
A. prokaryotic bacteria. B. the simplest animals. C. the most complex protists. D. plants. E. not alive.
Depolarization of the nerve cell membrane occurs because
A. sodium is not being pumped out of the cell. B. there is a reverse of polarity due to an increase in the amount of potassium in the cell. C. the permeability of the membrane changes and allows sodium ions to flow into the cell by diffusion. D. sodium ions are actively pumped into the cell.
Red blood cells are produced in the _______.
a) thymus gland b) liver c) pancreas d) red bone marrow e) kidneys
A number of different genes have been identified as affecting skin color and there are probably more as yet unidentified. Each of these genes likely has several regulatory protein factors affecting their expression, and those proteins are coded for by
yet more genes. Thus there are many genes, some of which have multiple alleles, involved in determining skin color. What property of skin color does this multigene foundation not explain? A) Some people tan easily and some get sunburned rather than becoming tan. B) Some people have very dark skin, some have very light skin, and there is nearly continuous variation in between. C) There is variation in the amount of vitamin D humans need. D) Skin color can be acted on by natural selection.