What properties greater hardness in minerals?
a. smaller atoms and stronger bonds
b. larger atoms and weaker bonds
c. larger atoms and stronger bonds
d. smaller atoms and weaker bonds

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.