The prediction, during the early 1800s, that our human population would eventually reach a point where we cannot sustain ourselves has not occurred. Why?
A) The two world wars and the AIDS crisis caused such massive mortality that the human population has stabilized.
B) The prediction was wrong; human populations can grow indefinitely.
C) Technological advances unforeseen at that time increased the carrying capacity to a greater extent and faster than predicted.
D) Humans continue to find ways to enhance environmental quality, thus enabling more people to be supported.
E) Dramatic reductions in fertility rates ended population growth before the crisis point was reached.
C
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The three phylogenetic trees shown here all contain the same members and all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of more than one evolutionary line and does not include the most recent common ancestor of the included lineages? What type of group is this?
A. Tree 1; monophyletic.
B. Tree 2; polyphyletic.
C. Tree 2; paraphyletic.
D. Tree 3; monophyletic.
E. Tree 3; polyphyletic.
Which of the following is a major risk factor for developing diabetes?
a. geographic location b. obesity c. gender d. exposure to excessive sunlight e. vegetarian diet
Refer to Figure 44-3. The function of the structure labeled 14 is:
a. to stimulate the ventricles to contract.
b. to pump blood to the lungs.
c. to pump blood into the systemic circulation.
d. to receive blood from the systemic circulation.
e. to receive blood from the pulmonary circulation.
In order to disperse water throughout themselves more effectively, plants evolved
A. pores. B. high pressure in their roots. C. circulatory systems. D. vascular systems.