After my research the answer is that they are forms of electromagnetic radiation as far as I know.
A. Carbon
It's carbon because it is in all plants and fossil fuels. Hope this helps and is correct.
Answer:
(1). symbiont
Explanation:
The bacterium inside the human intestine is a symbiont and the bacterium-human interaction is a symbiosis of the commensalistic type.
Commensalism is a biological interaction (symbiosis) in which members of one species -in this case the bacterium- gain benefits while those of the other species -in this case the human- neither benefit nor are harmed.