According to the International Union for Conservation of Nature (IUCN), which of the following sequences shows groups with the highest percentage of species in danger of extinction, from most endangered (on the left) to least endangered (on the right
)? A) plants ? amphibians ? birds
B) amphibians ? birds ? plants
C) birds ? plants ? amphibians
D) plants ? birds ? amphibians
B
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Which of the following is a benefit of reconstructing evolutionary history from living organisms?
A. A range of features can be used to generate phylogenetic hypotheses. B. The time dimension of speciation events can be calculated with greater certainty. C. Evolutionary links running through extinct species can be inferred easily. D. The environmental context is more easily observable. E. None of the answer options is correct.
A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Both pre-¬ and post-¬zygotic isolating mechanisms have arisen. B. Reproductive isolation is incomplete. C. Pre-¬zygotic isolating mechanisms have arisen. D. Post-¬zygotic isolating mechanisms have arisen. E. Gene flow between the two populations does not occur.
Which of the following chemicals has the LEAST influence on the regulation of breathing rate?
a. O2. b. CO2. c. H+. d. N2. e. CO.
Somatic mutations may be inherited by the next generation
Indicate whether the statement is true or false