Question
“Respiration is a vital function of the body”. Justify this statement.
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| Phylum | Characteristics |
| (1) Porifera | (a) Tunic |
| (2) Coelenterata | (b) Collar cells |
| (c) Tentacles bearing cnidoblasts | |
| (d) Mantle |

(a) What does this picture given in the textbook indicate?
(b) Explain any two causes for this problem.
(c) Describe any two measures to eradicate this problem.