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

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.