Why does a metal doorknob feel cooler to your hand than a carpet feels to your bare feet?

Which type of fossil does this image depict?

Can someone me with 3 and 4 plz. this is for masteries test.

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.