Mutation that occurs when one base pair is replaced with a different one?

cancer   is   essentially   uncontrolled   mitosis   of specialized cells

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.

japan is the correct anwser because i already took the test and i passed it