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.

A carbonaceous film or carbon film is an organism outline of a fossil. ... Fossils usually form when sediment buries a dead organism. As sediment piles up, the organism's remains are subjected to pressure and heat. These conditions force gases and liquids from the body

B) Residue is left on rocks when organisms decay.

Explanation:

carbon films: residues from decayed organisms left behind on rocks.

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