All crocodilians
a. live in or near water.
b. are predators with sharp teeth.
c. have a four-chambered heart.
d. show parental behavior.
e. fit all of these descriptions.
Answer: e
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Which of the following is true about the chemical bonds found in proteins and nucleic acids?
A. Covalent bonds result when an electron is completely transferred to another atom such that the atoms are drawn together by electrostatic charges. B. Ionic bonds result when two atoms share electrons equally. C. Atoms having a small difference between their electronegativities are more likely to form covalent bonds. D. Ionic bonds are most likely to form between two metal atoms. E. The strength of a covalent bond can vary with the salt concentration of the environment.
Concentrations of CFCs in the upper atmosphere are currently:
a. rising dramatically b. leveling off c. declining sharply d. undetectable e. rising slowly
The way individuals within a population are arranged with respect on one another is called population
A. diversity. B. density. C. logistics. D. distribution.
Narrow, parallel-veined leaves are characteristic of:
A) both monocots and dicots. B) many dicots. C) non-flowering seed plants. D) monocots.