Question

Blood is a type of connective tissue, which has?
A. RBC's
B. WBC's
C. Platelets
D. All of the above.

Answer 1

Hint: A connective tissue that has a fluid matrix, called plasma, and no fibres are known as Blood.
The blood is made up of liquid and solids. Erythrocytes also known as red blood cells are the predominant cell type which is involved in the transportation of oxygen and carbon dioxide. The presence of various leukocytes called white blood cells is also seen which is involved in the immune response. It contains platelets as well. Platelets are the tiny blood cells that help the body to form clots which helps stop the bleeding.

Complete answer:
Option (A) is RBC's
Red blood cells also termed to as red cells, red blood corpuscles, haematodes, erythroid cells or erythrocytes, are the most common type of blood cells and are the vertebrate's principal means of delivering oxygen to the body tissue via blood flow through the circulatory system.

Option (B) is WBC
White blood cells (WBCs) are also known as leukocytes or leucocytes. These are the cells of the immune system which are involved in the protection of the body against both infectious diseases as well as the foreign invaders. The derivation of white blood cells is from multipotent cells in the bone marrow which is known as hematopoietic stem cells.

Option (C) is platelets
Platelets (thrombocytes) are the colourless blood cells that help in blood clotting. Platelets stop the bleeding by the means of clumping and forming plugs in the blood vessel injuries. As a result of a bone marrow disorder such as leukemia or an immune system problem, Thrombocytopenia might occur.

Option (D) - All of the above
The liquid part of blood which is called plasma is made up of water, salts, and protein. Around half of the blood is plasma. The solid part of the blood contains the red blood cells, the white blood cells and the platelets.

So, the correct option is an option D- All of the above.

Note:
Blood is a body fluid present in humans and other animals which helps in the delivery of necessary substances such as nutrients and oxygen to the cells and in the transportation of metabolic waste products away from those same cells. It is composed of blood cells suspended in blood plasma in vertebrates.