"how can you visually distinguish between newly formed cells and older cells?

By looking how degraded the telomere (a compound structure at the end of a chromosome)  is, you see that;

Longer = younger

Shorter = older

New cells are smaller, nucleus takes up more space in Cell = younger.

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