The striking dissimilarities in plant communities among different biomes that have the same average yearly amount of rainfall can be explained by the fact that
A) plant communities are influenced more by the acidity of rain than by the amount of rainfall.
B) plant communities are not influenced by rainfall.
C) plant communities occur randomly, depending on where seeds are blown or carried.
D) plant communities evolve more slowly than changes in weather patterns.
E) temperature and rainfall interact to influence plant communities.
E
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Viruses can control host population
a. by reducing their numbers. b. by modifying their growth rate. c. by increasing their capacity to expand. d. by making them more attractable to predators. e. by attaching to the host membrane, causing the host cell to sink.
The _____ are important plant pathogens
a. dinoflagellates c. water molds b. ciliates d. slime molds
The developing embryo in the accompanying figure is representative of development in a(n):
a. bird. b. annelid. c. sea star. d. frog. e. mammal.
Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
A) a mineralized, bony skeleton B) opercula C) a spiral valve intestine D) a swim bladder