That's a good question. I can imagine that there was a time before there was life on Earth, and then clearly there was a time X-hundred thousand years or a million years later when there were things that we would all recognize as biological.
What Causes High White Blood Cell Counts? White blood cell counts are elevated when the body is fighting an illness or disease, so a high count is indicative of an infection. Often, your doctor will order another round of tests after he or she determines you have a high white blood cell count.
A: A low white blood cell count is an indicator of serious infections, bone marrow deficiency, autoimmune disorders and certain types of cancer, according to MedlinePlus. Several types of medications, such as anti-seizure drugs and chemotherapy drugs, also cause decreased WBC counts.