How does today’s climate compare to most of the Earth’s history, and what does that information
indicate about how human activities can affect climate?
What will be an ideal response?
The earth is currently in a relatively cool period, relative to the history of climate. While the Earth’s
climate has experience repeated temperature shifts, the changes have occurred slowly relative to the
lifetime of individual organisms, which allows adaptations of populations and evolutionary lineages.
Evidence suggests that today’s climate is changing faster today than in the past.
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Allopatric speciation occurs because a population
A. merges with another population of the same species. B. becomes geographically isolated and undergoes genetic change. C. becomes extinct and is replaced by a population of a different species. D. shows little genetic change from generation to generation. E. experiences hybrid sterility.
The AIDS phase of HIV infection begins when the concentration of CD4 T cells in the blood drops below what concentration?
A) 2,000 cells per cubic millimeter B) 1,000 cells per cubic millimeter C) 500 cells per cubic millimeter D) 200 cells per cubic millimeter E) No CD4 T cells are observed.
What does Pseudomonas aeruginosa not cause?
What will be an ideal response?
Which of the following types of reproductive barriers separates a pair of species that could interbreed but for the fact that one mates at dusk and the other at dawn?
A) temporal isolation B) habitat isolation C) behavioral isolation D) mechanical isolation