Is a trait with a functional role in the life or an organism that is maintained and evolved by means of natural selection

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

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

What is turgor pressure, what causes it, and what does it do for a plant?