Currently behind in biology pls help

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

What would most likely happen if a person increased the amount of saturated fat in his or her diet? the person's risk of cardiovascular disease would increase. the person's risk of cardiovascular disease would decrease. the person's bad cholesterol would decrease. the person’s good cholesterol would increase.