What causes water molecules to stick together in liquid water? O A. Hydrogen bonds
B. Water vapor
C. Carbon dioxide
D. Sun's gravity

A. Hydrogen bonds

Explanation:

A. Hydrogen bonds causes water molecules to stick together in liquid water.

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.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds