Can someone please help me with this AP biology question?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Where can dna be found in a prokaryotic cell

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.