13. which of the following represents replacement reproduction?
a. each couple has only two children
b. a couple has no children but each has two siblings
c. a government policy that limits the number of children per family
d. a couple with four children
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The answer is A. Each couple has only two children

Explanation:

The replacement reproductionis inferred to the minimum reproduction that a closed population needs so that it remains endlessly in time without decreasing its volume. This value is around 2.1 children on average. This is understood that a woman must reproduce herself and her partner, the decimal is because there are women who have no children.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.