Question

what is the shape of RBCs and amoeba?

Answer 1

Hello Dearie 
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The shape of RBC is Biconcave disc- like structure 
This shape helps RBCs to move trough blood and deliver the hemoglobin 
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The Amoeba have not a definite shape .It can change its shape by pseudopodia .
this shape helps in endocytosis(engulfing the food )
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Answer 2

RBC  (Red Blood Cell) - RBC serve as a function for transport of oxygen across the body, because it contains hemoglobin (oxygen carrier)  .

  SHAPE:It is a biconcave,disc shaped cell, without a nucleus
       SIZE: 7-8 microns in diameter
VOLUME:80-100 femtoliters
LIFESPAN: 120 Days
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Amoeba- Amoeba do not have a well specified shape. It changes it shape according to its need. It change its form during endocytosis, engulfing food,osmoregulation, forming food vacuole.

SHAPE: undefined
    SIZE: 250 and 750 microns.
VOLUME:188 µm³ - 2860 µm³
LIFE SPAN:2-3 Days