Arteries<span> have thick, elastic, muscular walls whereas </span>veins<span> have thin walls with few elastic fibers</span>
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Answer:
Specifically, he observed that “the lower plants all consist of one cell, while the higher ones are composed of (many) individual cells.” In 1839 Theodor Schwann extended Schleiden's cell theory to animals.
Explanation:
Antibodies they fight diseases
On a hard surface. Your muscles are easier to find and relax on a hard surface lying on your stomach. When you are on a bed, there are many dips and contorts that mold with your body and it is not helpful when getting a massage
