Calcium, when written as Ca2+, represents _____.

A) molecular calcium
B) elemental calcium
C) calcium ion
D) a calcium free radical
E) one of the several calcium isotopes


Answer: C) calcium ion

Biology & Microbiology

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The cuticle of most insects is composed of:

A. structural proteins. B. pectin. C. chitin. D. waxy lipids.

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Which trophic level would be best represented by a rabbit?

a. decomposer b. detritivore c. primary consumer d. primary producer e. secondary consumer

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Refer to the accompanying figure. Which of these lungs would be best for an animal that is fairly active?

a. 1 b. 2 c. 3 d. 4 e. Any of these.

Biology & Microbiology

Select the phrases that apply to the sixth mass extinction.

A. human influenced B. Cretaceous period C. slow rebound of biodiversity D. asteroid

Biology & Microbiology