Why can’t we see the shape of dna

Differences between compact bone and cartilage

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 organ is the first to receive nutrients that have been absorbed from the digestive tract?