What is the correct term for an area of rotating currents in an ocean?

When ocean currents combine, they create an area of rotating currents called a(n)

The cluster of developing cells from conception until birth is called an

All eukaryotic cells contain small bodies called

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species