Answer:
Physical characteristics are defining traits or features about your body. These are aspects that are visually apparent, knowing nothing else about the person. The first thing you see when you look at someone could be their hair, clothes, nose, or figure. These are all examples of physical characteristics.
Red blood cells deliever oxygen
Answer:
They found a new sensory system in the human body, hiding in a network that runs through the blood vessels and sweat glands. This network is separate from the nerves that allow us to touch and feel. The existence of this system may explain why it is so difficult to treat patients who have fibromyalgia and other pain disorders. These glands were previously thought to be associated with the regulation of blood flow and sweating.
Explanation:
straight from the passage
