The shape of a raindrop:
A) remains constant throughout the journey from cloud to ground.
B) is initially that of a tear.
C) flattens out on the bottom as it falls.
D) is not affected by drag.
Answer: C
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If an organism's diploid cells have 40 chromosomes, then its haploid cells have
A) 80 chromosomes. B) 40 chromosomes. C) 20 chromosomes. D) none of the above
The 1994 Cairo Conference on Population and Development found that the greatest threats to the health of the environment were
A) poverty, development, and population growth. B) education and the overuse of modern medicine. C) agriculture and surface mining operations. D) trends toward urbanization.
Based on embryo studies, blood proteins, and biochemistry of muscle activity, chordates may be
more closely linked to echinoderms than other phyla. Indicate whether the statement is true or false.
Which of the following is the only description that does not describe magnetic reversals?
A. They are recorded in the ocean crust. B. We are unsure why they occur. C. They occur instantaneously. D. They occur roughly every 500,000 to 700,000 years. E. They are recorded in continental lava flows.