The countercurrent exchange system found in fish gills maximizes gas exchange efficiency by:
a. producing rapid water flows across the gill surface.
b. allowing water and blood to come in direct contact to maximize oxygen exchange.
c. having the most oxygen-depleted blood come in contact with the most oxygen-rich water.
d. having the most oxygen-depleted blood come in contact with the most oxygen-depleted
water.
e. decreasing the oxygen content of the blood leaving the gill filaments
D
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Which of the following statements is NOT true of megaspores?
A. Megaspores produce female gametophytes. B. Megaspores are larger than microspores. C. A megaspore is a kind of spore of a seed plant. D. The cells of the walls of the megasporangium are diploid but the megaspores themselves are haploid. E. Megaspores are diploid.
Sea lions have shorter lactation periods than true seals
Indicate whether the statement is true or false
The development of multicellular organisms likely originated
a. from colonies of unicellular organisms of the same species. b. from endocytosis of other cells followed by mitosis. c. from cooperation between different species of cells. d. from colonies of numerous species of cells. e. from endosymbiotic eukaryotes.
Oligosaccharides include ____.
A. sucrose only B. glucose only C. fructose only D. lactose only E. both sucrose and lactose