If a 55-gallon drum represented all the water on earth, how much water would be in the oceans?

What is the most appropriate method of gaining weight (muscle mass)

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity