Final answer:
Fibroblasts are the cells that organize connective tissues by producing fibrous tissue.
Step-by-step explanation:
The connective tissue proper is organized by fibroblasts.
Fibroblasts are the most abundant cells in connective tissue and they produce the fibrous tissue. They secrete many protein fibers, including collagen fibers, reticular fibers, and elastin fibers. These fibers provide strength, support, and flexibility to the connective tissue.