The tracheae of adult terrestrial insects have been a factor in the great abundance of insects because they serve the same function in terms of the delivery of respiratory gases to the cells as do
A. the gills of aquatic insects.
B. the Malpighian tubules of spiders.
C. the book lungs of spiders.
D. the closed circulatory system of cephalopods.
E. the lungs of mammals.
Answer: D
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Which of the following represents the ?G of the reaction in the figure?
A) a B) b C) c D) d E) e
The ability to extend a leg is the result of
a. contraction of ligaments and tendons. b. contraction of a muscle. c. lengthening of a muscle. d. a combination of push and pull by antagonistic muscle pairs. e. relaxation of myosin and actin proteins.
The study of the worldwide distribution of plants and animals is called
a. paleontology. b. microevolution. c. comparative morphology. 637 d. biogeography. e. phylogeny.
Which one of the following is not a variation of flowers frequently considered in investigations of flowers and their functions?
A. number of parts B. color C. shape D. fragrance E. preferred soil conditions