What is an analogy of protein synthesis

Ribosomes and tRNA

The ribosome will 'read' the mRNA and insert the appropriate amino acids. An

amino acid is a unit used to build up a protein , like a piece of timber used to build

up a house. There are 20 amino acids that cells can use, and different

combinations of these amino acids can make different proteins .

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

i believe your answer would be c.. : )