What are good topics/locations to do for a science project where each part of the topic has to represent an organelle?

I would say a plant of some sort because of what all they have inside.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).