Zoology Answers

_&_ is a characteristic chewing organ of sea urchins

Visceral clefts are present in the human embryo in between four to six weeks of early development. What happens to them during later development?

They form jaws

They form laryngeal cartilages

They form gill clefts

They form jaws and laryngeal cartilages

They dissaper during later embryonic development

^{Function of nutritive muscular cells in hydra}