The chemicals that are released from the hypothalamus, the gonads, and the adrenal cortex are called , whereas the chemicals released by bioelectrical impulses throughout the brain are called .

Homo heidelbergensis was a tall, muscular hunter, who used both tools and weapons. because h. heidelbergensis was not a gatherer/forager, but ate a varied diet including meat and fish, we would expect to see what anatomical changes?

Polar zones are cold and tend to be dry because of a pressure system of cold. low high

All eukaryotic cells contain small bodies called