I think it would be D a pure substance
Answer:
this has a profound impact on population dynamics-age structure
Explanation:
His genotypes are X to the power of H and X to the power of h the second numbers are exponents so it goes X to H and X to h i hope this makes sense i couldn't make them into exponents but i tried :)
Answer: Codons
Explanation: Three neighboring nucleotides form a unit known as the codon.
