I found all bio courses relatively easy (just memorize). I dont know much about the evo course but I took genetics and was a breeze. I took it with a chem course, an env science course, and two math courses all at same time in 8 week summer session (5 courses, 20 credits, 56 days = 4.0 gpa) and they were all easy. Hard part was taking 2 or more exams pretty much everyday M-F (some days 4 exams, and of course multiple finals on same day as well) for about 7 weeks str8.