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.
Quick Answer. Inadequate generation of red blood cells, platelets or white blood cells by the bone marrow can cause a low blood count. This can occur due to certain bone marrow diseases such as paroxysmal nocturnal hemoglobinuria, aplastic anemia and myelodysplastic syndromes, bleeding, and abnormal hemoglobin formation or red blood cell shape.