Nucleic acid because it is genetic material
Missense mutation comes under point mutation. In which single a single nucleotide gets changed which codes for the different aminoacids or simply the change in one pair of DNA. It is called non - synonymous mutations.
In silent mutation there is a change occur in DNA codon which never effect the amino acid translation and simply there is no effect or change in phenotype of a particular individual.
These muscle fibers attach to bones allowing movement in joints.
B.
Most animals came from the Ancient lobe-finned fish them depending on their ecosystem evolved the bones to better suit their needs.
They usually mate in water and they lay eggs.