The evolution of which characteristic allowed for the development and enlargement of complex internal organs? a. segmentation b. tissue c. body cavity d. exoskeleton

It's B. tissue: it contains a group of cells which make up a tissue, which a group of tissues make up an organ, a group of organs make up an organ system and a group of organ systems make up a body.

A group of cells ⇒ A tissue, a group of tissues ⇒ an organ, group of organs ⇒ an organ system, group of organ systems ⇒ a Body

It's not C. Body Cavity: any space in the body

It's not A because, Segmentation is movement of the body with no bones in it.

It's not D because it's the external skeleton that supports and protects an animal's body

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can