Explain how a school bus uses all of these energy types. -Mechanical
-Chemical
-Electrical
-Thermal

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.

you can have just about every answer you can think of