Why start insisting on definite articles at this point? They were not required in earlier sections.
I agree. The policy on the use of 'a', 'an' or 'the', or no article at all, is very confusing on this course.
It is not required now. So someone reported it and it was fixed. Just report. It was a mistake.
"The trees environment" doesn't make sense. If it is a possessive, there needs to be an apostrophe somewhere: "The tree's environment" or "The trees' environment."
So... a forest? I know that Forest has its own word but I'm trying to think of an example where you wouldn't just say forest in place of this.
No that wouldn't make sense in English, the environment isn't considered animate so you wouldn't assign any belonging to them.