Which characteristics describe the genetic code of humans? Select three options. can help in development of effective medications
can only help understand human genetics
can help explain genetic diseases
composed of about 19,000 genes
composed of 23 chromosomes

A, D, E

Explanation:

Ok so the genetic code of humans is called DNA, and DNA can help with medications, B isn't true because DNA can help, but isn't the only thing that provides the answer. Perhaps DNA could provide some of the answer to some Genetic diseases, but not entirely, as some mutations are sometimes unknown.  The DNA holds around 19,000 genes but it only makes around 1% of the DNA. The DNA in a human, has around 23 chromosomes in each part of the cell, and together would make around 46 chromosomes in total.

"a.) well–developed vascular system."

the answer would be knowledge about cars!