Why does your body need to breathe in oxygen? a. Your blood uses the oxygen to help it clot and fight disease.
b. Your lungs store oxygen in the alveoli to help absorb carbon dioxide.
c. Your cells use the oxygen to break down sugar and produce energy.
d. Your heart uses the oxygen to make blood.

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

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.