What age group on a population pyramid would you examine to predict the population in 25 years?
A. 10-15
B. 25-30
C. 20-25
D. 0-5
Answer: D
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The exchange of gases across a respiratory surface always occurs by
A. diffusion. B. facilitated transport. C. bulk flow. D. active transport. E. osmosis.
Humus does not include:
a. feces b. dead organisms c. leaf litter d. weathered rock e. decomposing organic matter
Which of the following characteristics is not shared by typical birds and mammals?
a. four-chambered heart b. milk production c. four limbs d. endothermy e. insulating skin structures
Which of the following is the best definition of
sympatric speciation? a. species that evolve due to geographical distance b. mechanical isolation acts to prevent speciation c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time d. ecological isolation e. evolutionary change that creates two species occupying the same space