which chromosomes are the sex chromosomes A. chromosomes 1-22 B. the 3rd pair of chromosomes C. the 22nd pair of chromosomes D. the x and y chromosomes

D.

Explanation:

Of the 23 pairs of chromosomes, the X and Y are the pair that determines the sex of the child.  X chromosomes stand for female, while Y chromosomes stand for male.

XX means a female

XY means a male

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when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

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