Which of the following is NOT true about mass extinctions?

a. It happens when a species goes extinct.

b. It can be caused by gradual environmental change.

C. It can be seen in the fossil record.

d. It can be caused by a catastrophic change.

i love you and i play fortnite add me rod0107

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.