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 are formed when organisms decay. As they decay, a thin layer of carbon residue is left on rocks. This residue outlines the shape of the organism.

• The first option “Organisms turn into rock” is incorrect. Fossilization processes are more complex than just turning into rock in a simple sense for carbon - films.
• The third option “Hollow forms are left in sediment by decaying organisms” describes mold fossils, not carbon films.
• The fourth option “Organisms leave evidence of their activities, such as footprints” describes trace fossils, not carbon films.

Answer:

Residue is left on rocks when organisms decay.