Question

problem: what is an onion made out of? background: there are two main types of cells, plant cells and animal cells. those that are found in onions are plant cells. plant cells have a rigid outer layer called a cell wall. this cell wall gives plant cells a definite boxy shape, which is why robert hooke called them “cells” when he first observed them in 1663. you will have the chance to become young robert hooke yourself and explore the basic units of structure and function in living things...cells! hypothesis: my hypothesis is the cells inner layer of the onion.

Explanation:

Onions are plants, and plants are composed of plant cells. Plant cells have a cell - wall which gives them a boxy shape. So, an onion is made out of plant cells.

Answer:

An onion is made out of plant cells.