In most eumetazoans, the nervous system is derived mainly from which embryonic cell layer?
a. mesoderm
b. epiderm
c. mesoglea
d. endoderm
e. ectoderm
ANSWER: e
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As a person goes from rest to full-effort exercise, there is an increase in the _____
A) tidal volume B) vital capacity C) residual volume D) total lung capacity
Although the phylogenetic lineages for hominids are not definitive, four of the five statements are possible. Select the exception
a. Homo preceded Australopithecus. b. Homo sapiens is the most recent. c. Australopithecus is probably more ancient than Homo. d. Homo erectus preceded Homo sapiens. e. Homo habilis preceded Homo erectus.
The growth rate of a population per unit of time is calculated by using this formula: G = r x N. What is the quantity r and how is it calculated?
a. The quantity r is the exponential growth rate and is calculated by subtracting the number of deaths from the number of births. b. The quantity r is the per capita growth rate and is calculated by multiplying the number of births and the number of deaths. c. The quantity r is the per capita growth rate and is calculated by subtracting the number of deaths from the number of births. d. The quantity r is the biotic potential of a population and is calculated by adding the birth rate and the death rate. e. The quantity r is the monthly net increase of a population and is calculated by subtracting the number of births from the starting population size.
The relationship between the yucca plant and
the yucca moth that pollinates it is best described as
a. commensalism. b. parasitism. c. predation. d. mutualism. e. all of these