A circulatory system is very essential in mammals but not...
A circulatory system is very essential in mammals but not in smaller organisms like Amoeba because
Amoeba lives in freshwater
Diffusion is sufficient to transport materials in Amoeba
Amoeba lacks blood containing haemoglobin
Amoeba exibits anaerobic respiration
Correct answer is B
No explanation has been provided for this answer.
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