During phase "1" in the figure above, the size of the deer population grows slowly because ____
a. predators eat fawns as they are born
b. the number of breeding individuals is small
c. the temperatures are relatively extreme
d. the amount of food available is relatively scarce
e. fawns are subject to disease
ANSWER: b
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Why is an estuary considered an intermediate biome?
A. It is the transition zone between freshwater and saltwater biomes. B. It will seasonally dry up and cease to be a biome. C. It is only a biome during high tide. D. It is intermediate in size, smaller than the largest biomes but larger than the smallest biomes.
Why does external fertilization typically occur much more often in aquatic animals than in terrestrial animals?
A) The gametes are hydrophobic, so they must be suspended in water to avoid clumping. B) The gametes must be produced in large numbers, which can occur only in aquatic environments. C) The gametes must be kept wet to avoid desiccation.
In which of the following excretory tubule segments in mammals does essentially all of the glucose
and amino acids from the filtrate get reabsorbed?
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
Viruses are most closely related, in that they share a common ancestor, to which domain of life?
a. bacteria b. Viruses are not considered to be part of the tree of life. c. archaea