Why are Greenhouse gases important to life on Earth? A.
They are the gases plants need to grow.

B.
They keep meteors from hitting Earth by burning them up.

C.
They keep oxygen from escaping into outer space so living things can breathe.

D.
They trap in heat which keeps Earth at a temperature that is comfortable for most living things.

sorry i can't speak english

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

since electrons are negative the answer is neagtaive