How are casts formed by decaying organisms?

Cast fossils are formed when an organism dies and is buried between layers of mud and silt. The buried organism decays and the hardened rock leaves an impression where the organism once was. Lastly, mineral-enriched groundwater fills in the mold and hardens to form a cast fossil.

Explanation:

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.