D. British Columbia, I think. I'm not 100% sure though. Hope that helps.
Answer:
no entiendo esa tradición, sorry
Tetravalent
We have already seen an example of how a covalent bond can form between two hydrogen atoms producing molecular (H2) as opposed to the atomic form of hydrogen. ... As in all its compounds and its elemental forms, carbon is tetravalent, which means that it always forms four bonds.
Answer:
Not enough details here:((
Internal is like how hot it is and external is like how much heat it gives off
