You have a minor misspelling in the following sentence:
They first of all affect the food chain which is an essential for the maintainance of the environment and all its apsects including humans.It should be maintenance instead of maintainance.
You have a minor misspelling in the following sentence:
They first of all affect the food chain which is an essential for the maintainance of the environment and all its apsects including humans.It should be maintenance instead of maintainance.
Thank you @grammarnazi.