Question

16 what type of blood cell is biconcave and lacks a nucleus when they are mature? multiple choice white blood cells red blood cells macrophages platelets

Explanation:

Red blood cells are biconcave in shape and lose their nucleus as they mature, which allows for more space to carry oxygen. White blood cells have nuclei and are involved in immune - response. Macrophages are a type of white blood cell with a nucleus. Platelets are cell - fragments and not true cells with a biconcave shape.

Answer:

Red blood cells