This is the comparison of amino acid sequences in proteins. a close match of the amino acid sequences in comparable proteins in different species indicates that those proteins evolved from a common ancestor.

A sequence alignment in bioinformatics is a way of representing and comparing two or more sequences or chains of DNA, RNA, or primary protein structures to highlight their areas of similarity, which could indicate functional or evolutionary relationships between the genes or proteins consulted. The aligned sequences are written with the letters (representing amino acids or nucleotides) in rows of a matrix in which, if necessary, spaces are inserted so that the areas with the same or similar structure align.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons

From a high concentration to a low concentration.