The secretion of tears, milk, saliva, and earwax is a function of which tissue?
a. epithelial
b. loose connective
c. lymphoid
d. nervous
e. adipose
ANSWER: a
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The production of pollen, seeds, and flowers attributed to the widespread distribution of angiosperms. Why is the production of pollen an advantage?
A. It allows fertilization in the absence of water. B. It allows fertilization in moist areas. C. It promotes pollination. D. It is necessary for sexual reproduction. E. It protects and nourishes the embryo.
As part of your research project, you travel to an island to learn more about the habitats and relationships of flies, spiders, and centipedes. You and your assistant plot out five different areas on the island and count the numbers of flies, spiders, and centipedes living in each plot. Your results show the following: Plot Flies Spiders Centipedes1300254242617103147152147397805791393The most plausible explanation for the high number of spiders in plot 4 is:
A. the flies and spiders worked together to eliminate the centipedes. B. there are too many flies overall. C. the spiders preyed on the centipedes and ignored the flies. D. there are no centipedes to prey on the spiders and there are abundant flies upon which to feed.
Lichens are a mutualistic association of a fungus and either an alga or a cyanobacterium in which
A) the fungus protects the photosynthetic partner from erosion. B) the fungus slowly engulfs the photosynthetic partner. C) the fungus helps collect sunlight for the photosynthetic partner. D) the phototroph provides phosphorus to the fungus.
Countercurrent flow of water and blood increases the efficiency of gas exchange in _____
a. fishes c. birds b. amphibians d. all of these