Whats the difference between a hockey player and a hippie chick??

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they