Why do multicellular organisms generally live longer than unicellular organisms?

There are so many examples for that in different areas, like organic building blocks experiment carried out in our lab recently.

Here's one link: http://www.alfa-chemistry.com/products/organic-building-blocks-73.htm

plato users

given bodies of water

pacific / arctic / indian / southern

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers