Which best compares and contrasts red blood cells and white blood cells?
both are produced in the red bone marrow. red blood cells transport oxygen, and white blood cells protect the body
against disease.
both are produced in the red bone marrow. red blood cells carry all blood components, and white blood cells the
body heal cuts.
both are made of hemoglobin. red blood cells transport oxygen, and white blood cells protect the body against disease.
both are made of hemoglobin. red blood cells carry all blood components, and white blood cells the body heal cuts.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

yes, because even though a theory has a  lot of evidence to support it, it is not always true