These animals do not have a bony skeleton. All insects are invertebrates. They do have a skeleton but it is on the outside of their bodies and is not made of bone. These two main groups have been divided into smaller groups.
The white blood cell (WBC) count indicates the number of white blood cells in a sample of blood. This count provides a clue to the presence of illness.White blood cells are made in the bone marrow and protect the body against infection and aid in the immune response.his count provides a clue to the presence of illness. White blood cells are made in the bone marrow and protect the body against infection and aid in the immune response.
White blood cells circulate throughout the body, ready to fight infections. They live about two or three weeks, when they are broken down and recycled by the body. A normal white blood cell count is between about 4,500 and 10,000 cells per microliter. Many conditions can cause a low white blood cell count: â¢ Infection (which usually increases the white blood cell count, but may decrease it). â¢ Drugs, especially chemotherapy. â¢ Human immunodeficiency virus (HIV). â¢ Severe alcohol abuse.