Question

what type of fossil is this?
mold
resin
cast
trace
body

Explanation:

The fossil in the image appears to be a body fossil, as body fossils are the actual remains or parts of an organism (like the shell structure here, typical of ammonites, which are preserved body parts). Mold is an impression, cast is a copy from a mold, trace is evidence of activity, and resin is for amber - this fossil shows the actual organism's body part.

Answer:

body