Question

which type of fossils form from hardening sediment? casts tar pit fossils carbon films amber fossils

Explanation:

Cast fossils form when an organism's mold fills with sediment that hardens over time, preserving the organism's shape. Tar pit, carbon film, and amber fossils form through different processes (entrapment in tar, carbonization, and entrapment in tree resin respectively) rather than hardening sediment filling a mold.

Answer:

casts