During cellular respiration, every living thing in this food web uses gas and releases back into the environment.
a)
carbon dioxide: oxygen
b)
oxygen: carbon dioxide
c)
carbon dioxide: hydrogen
d)
carbon dioxide: water vapor

How do you date a sample of rock that you suspect as being one of the earliest on earth

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.

Which of the following is not associated with invasive species?