Our blood contains a large proportion of the iron in our bodies. Because women lose blood during a period, they also lose iron. This means that they need more iron in their diet to counteract this.
<span>Chronic stress that weakens systems in the body.</span>
D. Understand your personal heritage and it's basis in cultural values
Birds live virtually everywhere on Earth because they have evolved endothermy, the ability to use their metabolism to maintain a constant body temperature.
Birds belong to the class aves; they have an extremely efficient, one way breathing system with additional air sacs. Flying birds have strong, hollow bones and powerful flight muscles. Most birds can fly, they have a strong heart and an efficient way of breathing; which are necessary for birds to fly.
