Which kind of bond is formed when two atoms share electrons to form a molecule?

Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.

The answer for #3 is c but i don't know why

4. absorption has the highest risk of overdose due to increased potency. a. rectal b. oral c. transdermal d. intranasal