Struggle for life most severe between individuals and varieties of the same species; often severe between species of the same genus. The relation of organism to organism the most important of all relations.
Kermadi Mouadhar citeratför 4 månader sedan
little doubt about many slight changes, such as size from the amount of food,
nullhar citeratför 2 år sedan
the first author who in modern times has treated it in a scientific spirit was Buffon