How do microorganisms affect soil formation? a. by releasing toxic chemicals into the soil b. by increasing the nutrient content of soil c. by improving porosity via movement through the soil d. by releasing chemicals that react to form soil particles

24 would be the answer

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's.