Based on your analyses, which food would have the lowest nutritional value, i.e. the lowest amount of biochemicals?
a. Liver
b. Milk
c. Apple
c
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Some bird bones are hollow rather than honeycombed. The hollow bones mostly contain air sacs. The replacement of bone marrow with air sacs is properly understood as an adaptation that _____
1) reduces the weight of the bird 2) facilitates flight 3) eliminates the functions of bone marrow A) only 1 B) only 2 C) only 3 D) 1, 2, and 3 E) 1 and 2
The impact of natural selection is demonstrated by
a. directional selection. b. stabilizing selection. c. neutral selection. d. disruptive selection. e. directional selection, stabilizing selection, and disruptive selection.
What causes the differences between two human cell types (for example, a skin cell and a brain cell)?
A) Different cell types begin with the same genes but eliminate certain genes as they develop. B) Different cell types contain different genes. C) Different cell types contain different proteins that give each cell a different function. D) Different cell types contain the same genes but use different combinations of them.
Which of the following is the best description of a virus?
A) A virus is a life-form that can reproduce inside cells or independently. B) A virus is a tiny spore-producing cell. C) A virus is a noncellular, replicating entity. D) A virus is the smallest living thing.