Question

which fossils are formed by sediments and found in sedimentary rock? a mold of a fish skeleton and a cast of a clamshell a cast of a clamshell and a frozen animal a frozen animal and a piece of petrified wood a piece of petrified wood and a preserved insect

Explanation:

Molds and casts are formed by sediments. When an organism is buried in sediment, the sediment can harden around it. If the organism decays, it leaves a mold (an impression). If minerals fill the mold, a cast is formed. Sedimentary rocks are formed from sediments, so fossils like molds and casts (e.g., of a fish skeleton and clamshell) are commonly found in them. Frozen animals are found in ice (not sedimentary rock formed from typical sediments). Petrified wood involves mineral replacement (but the initial burial in sediment is part of the process for some, but the key here is molds and casts as classic sediment - formed fossils). Preserved insects (like in amber) are not formed by sediment in the same sedimentary - rock - fossilization process as molds and casts.

Answer:

A. a mold of a fish skeleton and a cast of a clamshell