Slow-wave sleep increases markedly at about 3 or 4 months of age is also known as rem sleep is also known as paradoxical sleep rarely occurs until 2 years of age

Answer;

-Increases markedly at about 3 or 4 months of age

Explanation;

-Quiet sleep, also called slow wave sleep, increases markedly at about 3 or 4 months of age.

-Slow wave sleep is a state of deep usually dreamless sleep that occurs regularly during a normal period of sleep with intervening periods of REM sleep and that is characterized by delta waves and a low level of autonomic physiological activity.

-Additionally, it is characterized by delta waves. Dreaming and sleepwalking can occur during Slow wave motion.

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).