Why is it unlikely that the frequency of muscular dystrophy in the human population will be reduced quickly by means of natural selection? a) natural selection acts only on homozygous recessive individuals b) muscular dystrophy is not a genetic disorder. c) the frequency of homozygous recessive individuals is too great. d) homozygous dominant individuals can have affected children.

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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.