During the Upper Paleolithic, humans in Eurasia relied heavily on:. a. marine sources.
b. hunting.
c. small-scale fishing.

The arrows indicate the direction of wind flow. which place experiences monsoons?

Can a trait be both polygenic and have multiple alleles? explain why or why not.

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled