Question

how do organisms form carbon films? organisms turn into rock. residue is left on rocks when organisms decay. hollow forms are left in sediment by decaying organisms. organisms leave evidence of their activities, such as footprints.

Explanation:

Carbon - films form when an organism decays and leaves behind a thin layer of carbon residue on a rock surface. The other options describe different fossil - formation processes. Organisms turning into rock is petrification. Hollow forms in sediment are molds. Evidence of activities like footprints are trace fossils.

Answer:

Residue is left on rocks when organisms decay.