Which of the following reduces gene flow between the gene pools of the two species on Sao Tomé, despite the existence of hybrids?
A) gametic isolation
B) reduced hybrid viability
C) hybrid sterility
D) temporal isolation
E) a geographic barrier
Answer: C
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Examine the phylogenetic tree depicted in Figure 26.17 as you address the following questions. The Crenarcheota, Korarchaeota, and Thaumarchaeota are three divisions within the Archaea that share a common ancestor
A. true B. false
In the golden-winged sunbird (Nectarina reichenowi), defending a territory saved the bird 780 calories a day in reduced foraging activity, but cost the bird 728 calories in defense of the territory. The net change in calories due to territorial behavior was
A. 53 B. 1,508 C. -53 (no gain) D. 52 E. -52 (no gain)
Which biome is characterized by rainfall under 25 cm/year, hot days, cold nights, and quickly blooming plants?
A. grasslands B. taiga C. temperate deserts D. tundra E. temperate deciduous forest
________ are plants with primitive conducting systems.
A. Ferns B. Mosses C. Coniferous trees D. Liverworts and hornworts