Which of the following is true of water-saturated soils?
A. They contain anaerobes.
B. They provide gases for soil microbes.
C. They have a low carbon dioxide content.
D. They have a high oxygen content.
Answer: A
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A cell in prophase I of meiosis has ______________ as many chromosomes as each of the daughter cells following cytokinesis of meiosis II
A. twice B. half C. one-quarter D. four times
Which combination is an example of prezygotic mechanisms of isolation?
a. hybrid breakdown and temporal isolation b. hybrid breakdown and gametic isolation c. hybrid sterility and temporal isolation d. mechanical and temporal isolation e. mechanical and hybrid breakdown
The potential seventh mass extinction refers to ____
a. the loss of 50% of species on Earth, including dinosaurs, at the end of the Cretaceous b. the most extensive loss of species that occurred during the Permian c. what will happen to the human species if a nuclear war occurs d. the rapid loss of biodiversity due to human degradation of the environment e. events that occurred just before insects diversified on land
Which of the following statements best defines an altruistic act?
A. imposes a cost on the performer without benefiting another individual B. imposes a cost on the performer and another individual C. benefits another individual at some cost to the performer D. benefits another, related individual at some cost to the performer E. benefits the performer and another individual