I'm not to sure, sorry. If you can explain the question more clearly I can try to help
The carbon cycle:
The carbon cycle is the process in which carbon travels from the atmosphere into organisms and the Earth and then back into the atmosphere. Plants take carbon dioxide from the air and use it to make food. Animals then eat the food and carbon is stored in their bodies or released as CO2 through respiration.
Hope this helps :)
One of the use of Agriculture is that It bears no effect on the environment
unlike any other industry , If it done right, Agriculture will leave no side effects to the environment. It basically just let the nature do it's thing and we harvest the result.
Yes, it is believed that one of the first Greek ancient astronomers, and the first notable Greek philosopher, was Thales, who lived at the beginning of the 6th Century BCE.