What argument would you give for the necessity of a cell wall in plants usually fixed in one place versus in animals usually moving from one place to the other?

Plants generally cannot move from one place to another, so they need a rigid structure to withstand environmental stresses like wind and rain and to stay upright. The cell wall provides this rigidity and structural support, and also helps leaves and flowers remain firm and maintain their shape.

Animals, on the other hand, usually move from one place to another, so they require flexibility rather than rigidity. Animal cells do not have a cell wall, which allows them to change shape easily. This cellular flexibility supports the overall movement and functioning of animal tissues. A rigid cell wall would restrict this flexibility and hinder movement. Therefore, a cell wall is necessary in plants for support and rigidity, while its absence in animals allows flexibility and movement.