Answer:
B
Explanation:
The iris controls the amount of light that enters the eye by opening and closing the pupil. The iris uses muscles to change the size of the pupil. These muscles can control the amount of light entering the eye by making the pupil larger (dilated) or smaller (constricted).
Answer:
The temperature of the CMB is cooler, not hotter, than at the time of the big bang.
Explanation:
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When the temperature lowers the plants can freeze and die. One way to prevent that is to cover the plants so they dont freeze
