__ are large WBCs that can swallow and destroy old and dying cells, bacteria, or viruses. a Neutrophils b Macrophages c Lymphocytes d Platelets

## Step 1<br />The question is asking us to identify the type of white blood cell (WBC) that has the ability to engulf and destroy old and dying cells, bacteria, or viruses. This process is known as phagocytosis.<br /><br />## Step 2<br />Let's examine each of the options:<br /><br />a) Neutrophils: These are a type of white blood cell that primarily function in the immune response by ingesting bacteria and other foreign substances. However, they are not the primary cells responsible for phagocytosis.<br /><br />b) Macrophages: These are large white blood cells that are known for their ability to perform phagocytosis. They can engulf and destroy old and dying cells, bacteria, or viruses.<br /><br />c) Lymphocytes: These are a type of white blood cell that primarily function in the immune response by producing antibodies. They are not the primary cells responsible for phagocytosis.<br /><br />d) Platelets: These are not a type of white blood cell. They are involved in blood clotting and do not perform phagocytosis.<br /><br />## Step 3<br />Based on the above analysis, the correct answer is b) Macrophages.