Why is there less oxygen at the surface level than in the depths of the ocean? a. oxygen is very light and rises to the top b. a lot of sea life consumes oxygen at the surface level c. nitrogen breaks down the oxygen at high temperatures d. oxygen is absorbed at the surface level but cannot remain there

The afrikaners are an example of a founder effect that occurs when a new colony is started by a few members of the original population and the random decrease in genetic variation is an example of

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?