On a frog, what is the advantage of having eyes that protrude from the top of the head?

Having eyes protruding from the head of a frog comes with a lot of positives.
The frog uses its eyes to swallow food, so as it quickly gets hold of its prey, it is able to eat it very fast as well.
Again the eyes act as security. When it is submerged in water, the eyes are out there watching and observing what is happening above the water.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on