Which of the following describes the main advantage of embryo transfer? o It reduces the spread of sexually transmitted diseases (STDs).
o It produces many more offspring from one superior female.
o It produces genetically similar animals needed for research.
O It is an easy and cost-effective method of breeding.

So the the main forces that keep the water on the surface of the planet are to do with plate tectonics. If the plates were to stop moving, the water probably would eventually be absorbed into the interior, although this process would take a very long time indeed.