Using biofuels instead of fossil fuels because biofuels are renewable is an
example of

Using biofuels instead of fossil fuels because biofuels are renewable is an example of renewable sources.

Explanation:

Biofuels is an example of renewable sources because biofuels is extracted from different parts of plants such as leaves and stem etc and plants is grown again and again and biofuels is again extracted from it. So we can say that biofuels is a renewable source.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72