The panting responses that are observed in overheated birds and mammals dissipate excess heat by _____
A) countercurrent exchange
B) acclimation
C) vasoconstriction
D) evaporation
D
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A DNA specimen that contains 30% guanine has ________ thymine.
A. 15%. B. 20%. C. 30%. D. 60%. E. The amount of thymine cannot be determined.
The cause of the Irish potato famine of the 1840s was the protist
a. Pseudomonas aeruginosa. b. Phytophthora infestans. c. Plasmodium falciparum. d. Physarum polycephalum. e. Phytophthora ramorum.
The largest cells in the vascular bundles are
a. sieve tubes. b. sclereids. c. vessel members. d. companion cells. e. parenchyma.
Which of the following statements regarding nutritive material and embryo in seeds is true?
A. In gymnosperms the female gametophyte provides food for the embryo. B. In angiosperms the female gametophyte provides food for the embryo. C. In gymnosperms the embryo is relatively small. D. In angiosperms the embryo is relatively large. E. Gymnosperms seeds do not have a seed coat.