At their Pleistocene maximum, glaciers covered _______ of the Earth’s surface.

What drives surface ocean currents?

Two identical cars are traveling at the same speed. One is heading due east and the other due north, as the drawing shows. Which statement is true regarding the kinetic energies and momenta of the cars?

Dabbling ducks live in large bodies of water such as lakes and rivers where they can feed on submerged aquatic plants.

Clutch refers to the number of eggs laid by one nesting female in birds.

After birds set up pair bonds, they disperse to their lek site to mate.

Most birds are viviparous, meaning that the eggs hatch in utero and they have live birth.

Desert climate associated with a rain shadow is found ____________.

Most of the ozone in the atmosphere can be found in the:

What effect does a land-use change, from forest to urbanized, have on the stream?