As pressure decreases so does boiling point. One reason astronauts wear space suits in space is because of the decreased pressure in space. Explain what might happen to the blood of an astronaut subjected to extremely low pressures.

a polar bond is formed when electrons are shared unevenly between atoms

the correct answer would be d. hope this !

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

im pretty sure its b