In the liver, excess amino acids are broken down into and rapidly combine with to produce urea, which is much less toxic to cells.

into - ammonia (Ammonium ions)

with - enzymes.

In the liver, excess amino acids are broken down into ammonia and rapidly combine with carbon dioxide to produce urea, which is much less toxic to cells.

Explanation:

answer; a male inherits only one allele of the x-linked gene controlling hair color;

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion