Compared to early hominid ancestors, modern humans have brains that are
a. larger and more rounded.
b. smaller and more rounded.
c. larger and more flattened.
d. smaller and more flattened.

a warm, wet climate will produce the highest rate of weathering. the warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering (figure below). this happens because plants and bacteria grow and multiply faster in warmer temperatures.

its temperature is increasing. this causes molecular vibrations to increase.