The human heart starts beating arounddays of embryonic development(. ) a) 22
b) 21
c) 23
d) 24

a) 22

Explanation:

Cardiogenesis which is the formation of the heart begins by day 21. The heart begins to form as paired tubes. By days 22 - 23 of embryonic development, the heart begins to beat. This represents the formation of the first vital organ of the body and it also causes the formation of left-right asymmetry of the body.

The days are counted from the day of the last menstrual period.

the answer for this question would be d. glaciers

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