does different person have slightly different composition in blood cells and different shape.

Yes, different people can have slightly different compositions in their blood cells. This can be due to various factors such as genetics, health conditions, diet, and lifestyle. For example, some people may have more or less of certain types of blood cells due to genetic variations or health conditions like anemia or leukemia.

As for the shape of blood cells, most people have similar shapes because the shape of blood cells is largely determined by their function. Red blood cells, for example, are typically round and flat to maximize their surface area for oxygen transport. However, certain health conditions can cause abnormal shapes. Sickle cell anemia, for example, causes red blood cells to become crescent or sickle-shaped.

So, while there are some variations in blood cell composition and shape among different people, these are usually within a certain range unless there are underlying health issues.