A circulatory system is very essential in mammals but not in smaller organisms like Amoeba because
-
A.
Amoeba lives in freshwater -
B.
Diffusion is sufficient to transport materials in Amoeba -
C.
Amoeba lacks blood containing haemoglobin -
D.
Amoeba exibits anaerobic respiration
Correct Answer: Option B
Explanation
There is an explanation video available below.