The first cells were ____
anaerobic
a. autotrophic
b. parasitic
c. anaerobic
d. aerobic
e. necrotic
ANSWER: c
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The scrotum is a sac-like structure outside the abdomen in which the testes are suspended. Why is this structure essential?
A. Sperm must be closer to the penis to be ejaculated. B. There is not enough space in the abdomen to grow properly. C. Lower temperature is required for normal development of sperm. D. There is too much hormonal influence if they remain in the abdomen.
The greatest number of AIDS cases has occurred in
a. North America. b. The Caribbean Islands. c. Latin America. d. Sub-Saharan Africa. e. East Asia.
How do planarians survive without a circulatory system? What will be an ideal response?
What characteristic(s) separate(s) greater apes from lesser apes
What will be an ideal response?