Question

if animals such as sponges and hydra do not have blood,how are waste materials removed from their body​

Answer 1

Answer:

Animals such as sponges and hydra do not posses anuy circulatory system. The water i which they live contains food and oxygen as it enters their bodies. The water carries es the waste materials and carbon dioxide as it moves out. Thus these animals donot need a circullatoery system like blood.