The periodic shedding of the uterine lining usually takes place -- O after menopause
O during pregnancy
O if fertilization does not occur
O before puberty begins​

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i think the answer would d

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds