Which statement is TRUE about DNA base pairing rules ? A-Cytosine can pair with Guanine only
B-Adenine can pair with Cytosine only
C-Adenine can pair with Thymine or Cytosine
D-cytosine can pair with adenine or guanine

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

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