Blood tests help doctors check for certain diseases and conditions. They also help check the function of your organs and show how well treatments are working. Specifically, blood tests can help doctors: 1  Evaluate how well organsâsuch as the kidneys, liver, thyroid, and heartâare working.uring a blood test, a small sample of blood is taken from your body. It's usually drawn from a vein in your arm using a needle. A finger prick also might be used. The procedure usually is quick and easy, although it may cause some short-term discomfort.
The first species of horse arose in Asia, Europe and North America between 45 and 60 million years ago, during the period known as the Eocene. Partial fossils of this diminutive species were discovered in England in 1841 by the paleontologist Richard Owen, who referred to it as Hyracotherium, or mole beast..
The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling Eohippus into the modern horse.