Four of the following statements are true of predator-prey coevolution. Which one is FALSE?
a. Each species exerts selection pressure on the other.
b. Predators are selective agents that favor improved prey defenses.
c. Prey with better defenses are selective agents that favor better predator hunting skills.
d. Coevolution only occurs in animals and is usually seen after one reproductive generation.
e. Camouflage, warning coloration, and mimicry are all examples of coevolution tactics.
ANSWER: d
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Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.
Answer the following statement true (T) or false (F)
Which of the following statements about invasive species is false?
A. The effect of invasive species on natural communities is always a reduction in diversity. B. Humans are responsible for dramatic increases in the number of invasive species. C. Invasive species often thrive in new areas because they have few natural predators. D. Introduction of invasive species has more devastating effects on islands because of the smaller number of predators and competitors in these systems. E. Invasive species reduce community diversity through displacement, competition, and predation.
Directional selection favors:
A. one narrow intermediate phenotype. B. two otherwise maladapted phenotype. C. one extreme phenotype. D. two extreme phenotype
DNA evidence suggests that not all___ share the same lineage; as a result, a new taxonomic group is being developed.
Fill in the blank(s) with the appropriate word(s).