What is a good estimate of the current rate of species extinction?
A) one species per day
B) one species per year
C) one species per millennium
D) one species per million years
Ans: A) one species per day
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Compared to the first big syphilis epidemic several hundred years ago in Europe, the strains of Treponema pallidum that cause syphilis today
A. tend to be more virulent. B. tend to be less virulent. C. are about equally virulent. D. cannot be compared.
V Fill in the blank(s) with the appropriate word(s)
Which of the following WBCs are NOT lymphocytes?
A) cytotoxic T cells B) helper T cells C) NK cells D) M cells E) B cells
What explains the coloration of giant kelp?
A. It is the result of waste products stored in the tissues. B. It warns grazers of their toxic properties. C. It facilitates absorption of the blue-green light prevalent in their environment. D. It facilitates absorption of the brown light prevalent in their environment. E. It camouflages them from grazers.