Which gland secretes growth hormone?
a. hypothalamus
b. pituitary gland
c. thyroid gland
d. adrenal gland user:
fertilization of the human egg cell usually occurs in the
a. uterus.
b. vagina.
c. fallopian tube.
d. ovary.

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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.