Countercurrent exchange allows for the removal of ____ of O2 from water flowing over gills
a. 50?60 percent
b. 60?70 percent
c. 70?80 percent
d. 80?90 percent
e. 90?100 percent
D
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The two tenets of natural selection are (select all that apply):
A. sexual reproduction in a population. B. variation in a population. C. competition in a population. D. increasing number of members in a population.
Which of the following is an example of a phenotype?
a. a cat’s genome b. the color and length of a cat’s fur c. the alleles that a female passes on to her offspring d. the DNA sequence of an allele e. the DNA sequence of an allele and the alleles that a female passes on to her offspring
Compared to adaptive immunity, innate immunity
has a(n) __________ response time, is triggered by __________, and has __________persistence. a. slow; pathogens; long-term b. immediate; tissue damage; no c. slow; tissue damage; long-term d. slow; pathogens; no e. immediate; pathogens; long-term
In the axoneme, dynein sidearms are anchored on
A) B tubules. B) A tubules. C) central pair tubules. D) radial spokes. E) interdoublet nexin.