Which of the following is an example of predation?
a) a mosquito feeds on the blood of a human
b) a protist breaks down cellulose in the gut of a termite
c) a remora hitches a ride on the fin of a shark
d) a lion hunts and eats a zebra for food
Ans: d) a lion hunts and eats a zebra for food
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When sperm enter the epididymis, they ________
A) are mature B) are incapable of moving on their own C) are ready to fertilize an egg D) come from the vas deferens
Which of the following statements about the nature of bone is true?
A. Bone is nonliving calcium deposits and removing bone is a bloodless operation. B. Bone is similar to cartilage, nearly inert, and with little blood supply. C. Bone is active, growing tissue with an extensive blood supply. D. The outer compact bone is nonliving calcium, but the bone marrow is active living tissue. E. Bone is active and living when formed by osteoblast but dies after it hardens.
An animal that only eats plants is a(n) ________
Fill in the blank(s) with correct word
The most common cause of traveler's diarrhea is
A) Shigella spp. B) Salmonella enterica. C) Giardia lamblia. D) Escherichia coli. E) Campylobacter jejuni.