What is the skeleton of an embryo made up of?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates

16 select the correct answer from each drop-down menu. sharks, whales, and dolphins share similar features such as body shape and the position of fins. hoy while whales and dolphins have lungs. these differences indicate that the organisms share a comme whales also possess a vestigial pelvic bone. the presence of the pelvis bone may indicate that whales reset next

Why do you suppose the structural polysaccharide cellulose does not contain branches?