A substance with a pH of 3 is how many more times acidic than a substance with a pH of 5?

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?

What do we call the process when two dominant alleles are expressed and do not blend? a. incomplete dominance b. codominance c. multiple alleles

Some plants have reproductive structures that them reproduce using natural forces or animals. how does the reproductive structure shown here ensure the reproductive success of plants?