Which amino acid--a, b, or c--actually falls between the other two in lysozyme primary structure (the order of the amino acids in the polypeptide chain)? masteringbiology?

Males of different species of the fruit fly drosophila that live in the same parts of the hawaiian islands have different elaborate courtship rituals. these rituals involve fighting other males and making stylized movements that attract females. what type of reproductive isolation does this represent?