In the carbon-oxygen cycle, carbon dioxide is used for and oxygen is used for

In the carbon-oxygen cycle, carbon dioxide is used for photosynthesis in plants and oxygen is used for cellular respiration in animals.

Carbon is used for photosynthesis by plants and oxygen is used for the respiration by animals.

Explanation:

Plants use carbon dioxide for photosynthesis and releases oxygen gas as a product.

Oxygen which is released is used by the animals for their cellular respiration and releases carbon dioxide which is again used by the plants for photosynthesis.

Hence, carbon is used for photosynthesis by plants and oxygen is used for the respiration by animals.

check for the pregnancy rating of drug. if its class c or d see if other alternatives

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."