Based on hierarchical levels of biological organization, which of these choices represents the broadest level?
A. Endocrine system
B. 3 toed sloths
C. School of piranhas
D. Amazon Basin
E. Jaguars, giant anteaters, macaws, capybaras
D
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There are different versions of the gene that codes for fur thickness, one of which codes for
thicker fur and another that codes for thinner fur. In 1995, about 50 percent of the animals had thicker fur, and the other 50 percent had thinner fur. In the spring of 2012, after several years of low snow cover, 70 percent of the population had thicker fur, while only 30 percent had thinner fur. This change in the population is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Cytoskeletal elements are found in
A) bacteria. B) archaea. C) eukaryotes. D) B and C only. E) A, B, and C.
Which of the following occurs when there are more reactants than products for a reaction?
a. The reaction is pushed toward the reactants by the low concentration of products. b. The reaction is pulled toward generating more reactants. c. The greater concentration of reactants pushes the reaction forward, toward generating more products. d. The reaction is pulled in the forward direction by the high concentration of products.
Four of the following animals form eusocial groups. Which one is the exception?
A. Termites B. Mole rats C. Wolf pack D. Honey bees E. Ants