I must be present in a compound for it considered organic

Carbon

Explanation:

Organic compounds must contain carbon. They also usually contain hydrogen,  oxygen, and often nitrogen and other compounds such as phosphorus.

Nearly all organic compounds contain carbon-hydrogen bonds.

c. 75.7

i think that is the right

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.