Accessory structures of the skin such as nose hairs serve the system by providing a mechanical filter against large objects entering the body.

answer:

The answer to your question is  respirtatory system. Have a good day!

answer:

Explanation:

Accessory structures of the skin such as nose hairs serve the respiratory system by providing a mechanical filter against large objects entering the body.

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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.