I think the letter is (D)
Answer: B cells can be influenced by genetic factors
Explanation: Daren has sickle cell disease. Sickle cell disorder is a kind of disease that affects the hemoglobin in the red blood cells. Hemoglobin, is a molecule in red blood cells that delivers oxygen to cells throughout the body. People with Sickle cell disorder have hemoglobin molecules called hemoglobin S, which distort the shape of the red blood cells. A normal red blood cell has a disc shape but people with sickle cell like Daren have their red blood cells and distorted into a sickle, or crescent, shape
A gene is changed to cause plants to be more drought resistant
<span>all of these; women over 35, those who already have a child with a genetic disorder, women who have had two or more miscarriages,
translates DNA instructions</span>
It means breaking hydrogen bonds.