AP biology help please!!!

 

Why are you marking this as not solved!

(a) - similar sequences in genes in closely related species
- we assume that DNA changes (mutation) at a constant rate
- the more similar the sequence the more closely related.
- Example: compare amino acid sequence of hemoglobin in vertebrates or Cytochrome C across a broad array of species

(b) - all of life on Earth uses DNA as its genetic information
- universal code
- many key genes and their protein products are well-conserved across very diverse organisms
- Example: Cytochrome C or other proteins involved in respiration

There