Vegetarians do not eat animal products but rather derive their protein from plant sources. which type of protein do vegetarian food sources lack?

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?

Which feature of a human community is similar to a niche in a biological community

Some substances but not other can cross the (blank) membrane of a cell