9. The main components of blood are: a. Proteins, plasma , neutrophils b. Platelets, red blood cells plasma, white blood cells c. Red blood cells, platelets d. White blood cells, red blood cells, oxygen

The correct answer is b. Platelets, red blood cells, plasma, white blood cells.<br /><br />Blood is a complex fluid that consists of several components, including platelets, red blood cells, plasma, and white blood cells. Platelets are small cell fragments that play a crucial role in blood clotting and wound healing. Red blood cells, also known as erythrocytes, are responsible for carrying oxygen from the lungs to the body's tissues and removing carbon dioxide from the body. Plasma is the liquid component of blood, which makes up about 55% of its total volume. It contains water, electrolytes, nutrients, hormones, and waste products. White blood cells, or leukocytes, are part of the immune system and help fight infections and diseases.