Cytosine pairs with guanine and thymine pairs with adenine.
I'd say A. Because the only data we have is that at a 5.4 pH level, flies are not welcome.
Hope it helped!
Answer:
Nematode.
Explanation:
Heartworms belongs to phylum Nematoda, their biological name is Dirofilaria immitis. Their body structure is a tiny thread-like parasite roundworm. Adult heartworms always live in the lung arteries and the heart of the dogs and other mammals, it can spread from one species to another by the mosquito bites. Some characteristics of Nematoda phylum are:
1) Their body structure is triploblastic, bilaterally equal and cylindrical in shape.
2) They show a tissue-level organization.
3) Their body keeps a pouch or pseudocoelom.
