A. Group of cells
Cells - Tissue - Organ ...
If you want to know more - look for "Biological Organisation"
An undifferentiated cell of a multicellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.
Vacuole is not a structure used for cellular movement
Answer:
The differential equations and the boundary conditions(initial and final)are shown in the attachment
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