•Red blood cells are not nucleated .but white blood cells are nucleated .
• Red blood cells contain haemoglobin and forms a red colour.but white blood cell doesn't contain any haemoglobin and are transparent thus don't posses any colour.
• Red blood cells are only of one type .but white blood cells are of two types granulocytes and agranulocytes
•Red blood cells carry oxygen with them and provide it to other part of the body but white blood cells act in fighting mechanism( as the fight with forgien particles).
•Red blood cells are around 12-16 gm in every 100 ml of blood but white blood cells are so less it is 6000-8000mm^3.

Red Blood Cells
Red blood cells, also known as erythrocytes, are one of the main components of blood. They are responsible for transporting oxygen to various tissues and organs in the body. Here are some key points about red blood cells:

1. Structure:
- Red blood cells are small, biconcave-shaped cells without a nucleus.
- They have a flexible membrane that allows them to change shape and squeeze through narrow capillaries.
- The main component of red blood cells is hemoglobin, a protein that binds with oxygen.

2. Function:
- The primary function of red blood cells is to transport oxygen from the lungs to the rest of the body.
- Hemoglobin within red blood cells binds with oxygen in the lungs and releases it to tissues and organs.
- They also help in removing carbon dioxide, a waste product, from the body.

3. Production:
- Red blood cells are produced in the bone marrow through a process called erythropoiesis.
- The production of red blood cells is regulated by a hormone called erythropoietin, which is released by the kidneys in response to low oxygen levels.

White Blood Cells
White blood cells, also known as leukocytes, are an important part of the immune system. They defend the body against infections, diseases, and foreign substances. Here are some key points about white blood cells:

1. Structure:
- White blood cells are larger than red blood cells and have a nucleus.
- There are different types of white blood cells, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each with specific functions.

2. Function:
- White blood cells play a crucial role in the immune response by identifying and destroying pathogens, such as bacteria, viruses, and fungi.
- They also help in the removal of dead or damaged cells and tissues from the body.
- White blood cells release chemicals called cytokines, which regulate the immune response and inflammation.

3. Types and Roles:
- Neutrophils are the most abundant type of white blood cells and are involved in the initial response to infections.
- Lymphocytes are responsible for producing antibodies and coordinating the immune response.
- Monocytes are phagocytic cells that engulf and destroy pathogens.
- Eosinophils and basophils are involved in allergic reactions and defense against parasites.

In conclusion, red blood cells are responsible for oxygen transport, while white blood cells play a crucial role in the immune response. The key difference lies in their structure, function, and types. Red blood cells lack a nucleus and primarily transport oxygen, while white blood cells have a nucleus and are involved in immune defense.