The current extinction rate is estimated to be at least how much greater than the background extinction rate?
a. 2
b. 5
c. 10
d. 50
e. 100
ANSWER: e
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Which trait is characteristic of a K-selected species?
a. adapted to rapidly changing environments b. small body size c. short generation time d. provide substantial parental care to offspring e. single reproductive event
Which conclusion is best supported by these data?
1.Infected children lived in areas with greater numbers of mosquitoes.
2.A higher number of mosquitoes were attracted to children that contained gametocytes.
3.Plasmodium secrete a chemical that mosquitoes can detect in the air.
4.Children without Plasmodium infection were least attractive to mosquitoes.
The physical location of a particular gene on a chromosome is called:a
an allele. b. its locus. c. a trait. d. a chromatid. e. its genotype.
The total of all chemical reactions occurring in a cell is called ________.
A. metabolism B. anabolism C. catabolism D. None of the choices are correct.