The ________ regulates the amount of light entering the eye

Fill in the blank(s) with correct word


iris

Biology & Microbiology

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Oceans cover what portion of the earth’s surface?

a. less than 10 percent b. more than 80 percent c. about 50 percent d. approximately 70 percent e. barely 20 percent

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Under some circumstances, natural radioactive substances, such as radon gas, can become concentrated and pose a threat to human health.

a. true b. false

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The ________ function to support, insulate, and protect neurons

Fill in the blank(s) with correct word

Biology & Microbiology

The amount of heat energy needed to raise 1 gram of water from 14.5°C to 15.5°C is called a(n) ________.

A. thermal unit B. calorie C. joule D. erg

Biology & Microbiology