Answer:
Hi... Before 1900 mendel was working about genetic so your answer is none of the above
A heterogeneous mixture composes of non- uniform components, so the concrete would be the answer, because you can tell the components from one another.
This zone cannot sustain life
To grow food to grow food
A membrane bounded organelle whose main function is to undergo protein synthesis would be the ribosomes. These can be embedded in the endoplasmic reticulum or be freely floating in the cytoplasmic region of the cell.
