The thyroid and parathyroid glands belong to the system.

Endocrine

Explanation:

The thyroid and parathyroid glands belong to the Endocrine system.

The Endocrine system is a group of glands that usually gives off hormones to certain parts of your body.

ANSWER:

Thyroid and Parathyroid gland are related to the endocrine system. These are glands that secret different hormones in the body that regulate the several functions of the body.

EXPLANATION:

Endocrine system is a "network of glands" in the body. The endocrine glands secrete various hormones that regulate and control the body in different ways.

The hormones are released into the "bloodstream" by these glands. It is important for the endocrine system to be healthy and function in a proper manner else the body develops several problems.  

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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