Answers

2015-05-18T22:31:20+05:30
Sponges and hydra do not have blood, because they do not need, their body wall is very thin and they are surrended by water . The water in which they live brings food and oxygen as it enter their body the water carries away waste materials and carbon dioxide as it moves out.................
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2015-05-19T09:37:57+05:30
Sponges and hydra do not contains blood....
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