Question

Why sponges
and Hydro do not circulatorySystem ? why is the colour of
blood red?! write
write any two function of
blood
​

Answer 1

Answer:

Animals such as sponges and Hydra do not posses any circulatory system. The water in which they live brings food and oxygen as it enters their bodies. The water carries away waste materials and carbon dioxide as it moves out. Thus, these animals do not need a circulatory fluid like the blood.