Presently, it is thought that organic polymers may have formed and accumulated on:

A) silt and sand.
B) sand and mud.
C) rocks and clay.
D) water and shells.
E) sand and heavy metals.

Organic Polymers

Large molecules composed of repeated subunits (monomers) that are typically carbon-based, like proteins, nucleic acids, and plastics.

Silt

Fine particles of rock and soil that are smaller than sand and larger than clay, often found on riverbeds and fertile agricultural lands.

Sand

Fine particles of rock and mineral matter, typically found on beaches, deserts, and riverbeds.