1.Ammonites
I think that the first picture of the Ammonites fossil is a replace remain fossil because originally it was a shell. And shell is made of calcium compounds or bone and in this picture it has been altered into a different substance. The molecules of the bone has been changed into some sort of rock over a period of time.
2. Trilobite
I think that the picture is a Mold and Cast fossil because it looks as if the animal that was fossilized had left an imprint of itself. The fossil must of dissolved out of the rock creating a mold and other types of sedimentary rocks must have filled its place creating a cast.
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