phospholipids, glycolipids, and sterols
Explanation:
All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. Leukocytes are found throughout the body, including the blood and lymphatic system.
A.
Explanation: Because he learned it in previous years when it was different, now it becomes hard to learn the new information.
Answer:
genetics, or different genes I think
