How many lymph nodes are in the body? what is the function of the lymph nodes?

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 was the land like over 500 million years ago? what was under the sea?

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.