Why are cell walls present in plant cells but absent in animal cells

The main purpose of cell wall is to give a plant rigidity and strength. Plants need this because they cannot move. Animals already have a skeleton so it would be useless for them to have a cell wall. Because animals have to move around in order to survive, they cannot have a cell wall.

Explanation: Big brains

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.