What are the three primary abiotic factors that produce earth's major climate zones

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Which enzymes break down carbohydrates?