If a skull became fossilzed it most likely be what type of fossil

In 2001, records showed that local stocks of fish were down worldwide. yet, records of harvests indicated that fish were being taken at records rates. what was actually happening?

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?

Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation