The tRNA lines the amino acids up to form... 1.a Congo line
2.a protein
3.a compact molecule
4.an alloy

2, they line up to form a polypeptide chain this forms part of a protein molecule.

2hydrogen and 1 covalent

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.