How do autotrophs and heterotrophs benefit one another within an ecosystem
a.) autotrophs fix carbon and produce oxygen for heterotrophs, which produce carbon dioxide for autotrophs.
b.) autotrophs synthesize atp and other nutrients for heterotrophs, which produce oxygen for autotroph.
c.) autotrophs produce oxygen and carbon dioxide for heterotrophs, which produce chemical energy for autotrophs.
d.) autotrophs transform chemical energy into radiant energy for heterotrophs, which fix carbon for autotrophs.

The correct answer is A. Autotrophs fix carbon and produce oxygen for heterotrophs, which produce carbon dioxide for autotrophs.

Explanation:

In an ecosystem, autotrophs refer to organisms such as plants that produce their energy usually through photosynthesis and by using carbon fixation, this means they take carbon dioxide, sunlight, and water and transformed in glucose used for energy and glucose that is released. On the other hand, heterotrophs such as animals are organisms that need to feed on others to obtain nutrients and energy.

These organisms related to autotrophs because some of them feed on autotrophs such as rabbits feeding on grass. But besides this, heterotrophs use the oxygen released by autotrophs during respiration and produce carbon dioxide that is taken by autotrophs. Thus, autotrophs and heterotrophs benefit one another as "Autotrophs fix carbon and produce oxygen for heterotrophs, which produce carbon dioxide for autotrophs".

"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."