You contain the same elements that are found in and around the earth. the atmosphere contains mostly nitrogen, 78%, and oxygen, 21%. these two elements chemically combine with carbon and hydrogen to form an important compound found in all living things. what is that compound?

a) carbohydrates
b) lipids
c) proteins
d) sugars

protein and lipids

Explanation:

Proteins, like carbohydrates and lipids, are compounds of carbon hydrogen and oxygen. However, unlike carbohydrates and lipids, proteins also contain the element nitrogen and are hence referred to as nitrogenous compounds. In addition to nitrogen, proteins may contain phosphorus or sulphur or both. Some proteins such as haemoglobin contain other elements such as iron.

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oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.