Why should you not use model organisms for genetic engineering?

What are the types of mutations, and how does each alter the encoded protein? college level answer

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?