What happens when oxygen atoms share electrons? A. They form polar molecules
B. They form covalent bonds
C. They form ionic bonds
D. They form water molecules

They form covalent bonds

Explanation:

They occur when atoms achieve stability by sharing electrons. covalent bonds are often represented as single lines in chemical formulas.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate