Fossils have been found on two continents that are split apart, this is evidence that ? a. there was a bridge b. the continents were once joined together c. the life just appeared in two locations independently d. they swam across the ocean

Suppose that a cylindrical tank 6 meters high with a radius of 2 meters is filled to the rim with water. the tank is buried so that the top of the tank is 1 meter below ground level. the space above the tank is not filled with water. calculate how much work needs to be done by a pump to pump the water out of the tank up to ground level. (the water weighs 9,800 newtons per cubic meter.)