Approximately how far back in time does the fossil record extend?
a) 3,500,000,000 years
b) 5,000,000,000,000 years
c) 6,000,000 years
d) 3,500,000 years
e) 6,000 years
Answer: a) 3,500,000,000 years
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The centrosome is associated with which class of cytoskeletal filaments?
A. microfilaments B. intermediate filaments C. microtubules D. Answers a and b are correct.
Which structure prevents blood flowing back into the heart from the aorta between heartbeats?
A. semilunar valve B. atrioventricular valve C. tricuspid valve D. mitral valve E. ductus arteriosus
The animal in the above photograph was
adversely affected by ____ and is making a comeback thanks to ____. a. global cooling; heat producing chemical added to their diet b. sexually transmitted viruses; a new vaccine c. limited number of natural cavities; artificial nesting boxes d. high incidence of males being born; transplantation of females from other areas e. all of these
Most chytrids eat
a. organic waste. b. are photosynthetic. c. strictly corn. d. muscle tissue. e. none of these.