Ecologists have documented the extinction over the last 20 years of ________ of the 110 species of harlequin frogs (Atelopus) native to tropical America.

A. 67%
B. 100%
C. 15%
D. None of the choices are correct.


Answer: A

Biology & Microbiology

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The part of a chromosome that shortens with each cell division, functioning as a "clock," is the

A) centromere. B) centrosome. C) centriole. D) telomere.

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Cell differentiation occurs due to ____

a. unequal cytoplasmic divisions b. the removal of different genes in different cell types c. polarization of the cell d. the presence of the X and/or Y chromosome in the cell e. changes in gene expression in different cell types

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Uniparental disomy can arise through nondisjunction in _____

1.meiosis 2.the early embryo 3.the zygote 4.all of the choices

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According to the above table, the foraging

characteristic that would benefit an animal most in a stable ecology would be? a. A baby garter snake captures and eats a slug. b. A sitter because it would have more trouble adapting to a changing environment. c. A forager because it has the ability to adapt quickly. d. Both the sitter and the forager are equally adept in a stable ecosystem. e. All of these would benefit an animal the most.

Biology & Microbiology