What can be sources of error in a pH lab measuring the pH of several substances?

what following? you said which of the following. but there is no be more specific.

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.

c. the initial amount of money placed in the savings account

answer; microsoft;