What trait gives seeds an advantage over spores?
A. Protected from the environment
B. Long-lived
C. Contain nutrients
D. Small in size
Answer: C. Contain nutrients
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If the environment surrounding a cell has a lower concentration of solute than the cell, the
A. environment is hypotonic to the cell. B. environment is isotonic to the cell. C. cell will die. D. cell will not experience a net gain or loss of water. E. environment is hypertonic to the cell.
Which structure, A, B, C, D, or E, produces enzymes that complete digestion of proteins, carbohydrates, and nucleic acids, and absorbs products of digestion?
1.A
2.B
3.C
4.D
5.E
About __________ species of birds have been described
a. 1,000 b. 2,000 c. 4,500 d. 9,000 e. 20,000
The number of chromosome pairs in a species is:
A) a function of the species' complexity. B) always 23. C) greatest among mammals. D) not correlated with the species' complexity. E) greatest among plants.