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
Biology & Microbiology
Under some circumstances, natural radioactive substances, such as radon gas, can become concentrated and pose a threat to human health.
a. true b. false
Biology & Microbiology
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