The endosymbiotic theory helps to explain the origin of which structures? mitochondria
ribosomes
nuclei
cell membranes

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation:

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully