<span>A millimeter is 1/1000th of a meter, and a micrometer is 1/1000th of a millimeter.</span>
Body fossils include molds and casts. A mold is the imprint left by the shell on the rock that surrounded it. Molds of the underside of shell may be left on the surface of rock that formed when sand or mud filled the inside of the shell.
A) It was very hot and very tightly packed together.