Trace fossils, like coprolite and gastrolith, can tell us what?

a. that an organism was once active in an area

b. typical number of dinosaur eggs in a nest

c. exactly how big an organism was

d. that an organism was never active in the area

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy