Hello! The answer is cell
I also believe the answer is A.
The sickle form of the hemoglobin gene is created when an adenine nucleotide is changed to a thymine. ... That single amino acid replacement in the -globin protein alters the shape and the chemistry of the hemoglobin molecule, causing it to polymerize and distort the red blood cell into the sickle shape.
Would it be its beak? It's hard and protective like scales
The answer is A. number of pots