Protein. A chain of amino acids, known as a polypeptide chain, makes up a protein. Foods that contain protein include meat, dairy, eggs, soy, nuts, etc. Hope this helped :)
No, the correct term is embryo. Embryo is in humans, the
name for the developing organism during the first eight weeks after conception.
While Zygote is for fertilised egg. And Fetus is the term for the developing
organism between the embryonic stage and birth.