<span>Humans have an endoskeleton, whereas insects have exoskeletons.</span>
Answer:
In the recent years,advances in the agricultural field as well as genetic engineering field has made it possible to produce large number of crops which have increases source of nutrition in them. Due to this, conditions such as famine re being completely eradicated from the world. During the previous times, we see how enormous number of deaths were caused just due to lack of food and famine conditions.But in today's world, we hardly hear that a country has been hit by famine. Although some countries still have malnutrition in them but these situations are being tackled. Hence, easy access to food resources has turned the rich man diseases to become poor man's diseases too.
Answer:
Normal changes in the heart include deposits of the "aging pigment," lipofuscin. The heart muscle cells degenerate slightly. The valves inside the heart, which control the direction of blood flow, thicken and become stiffer. A heart murmur caused by valve stiffness is fairly common in older people.
