HOX genes are a subset of homeotic genes and control the body plan of an organism. These genes are highly conserved across organisms. What does this tell us about the evolutionary history of organisms?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Which element is found in both dna and proteins

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that