Answer:
it takes the place of a noun
Explanation:
D, because your brain is what makes almost all of your organs work.
Answer:
a. It can be used for photosynthesis.
Explanation:
Since carbon dioxide is needed in the photosynthesis process, then much of the carbon dioxide which is produced by green plants is not always excreted in form of metabolic waste because it can be easily used in the photosynthesis process.
If this was a true or false this is most definitely true because with out those how will you make a positive choice.<span />