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Deforestation leads to the loss of biodiversity and of indigenous tribes’ homes. Deforestation also affects billions more people around the world indirectly, through its impact on climate change, water and nutrient cycling and food availability. The world’s benefit from conservation far outweighs the costs to the owner, such as the profit they lose by not logging. It would thus make sense for the wealthier North to simply pay the tropical countries in the South to conserve and protect their forests.
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Vein because they have valves to prevent back flow of blood.
Answer:
The leukocyte, commonly known as a white blood cell (or WBC), is a major component of the body’s defenses against disease. Leukocytes protect the body against invading microorganisms and body cells with mutated DNA, and they clean up debris. Platelets are essential for the repair of blood vessels when damage to them has occurred; they also provide growth factors for healing and repair.Although leukocytes and erythrocytes both originate from hematopoietic stem cells in the bone marrow, they are very different from each other in many significant ways. For instance, leukocytes are far less numerous than erythrocytes: Typically there are only 5000 to 10,000 per µL. They are also larger than erythrocytes and are the only formed elements that are complete cells, possessing a nucleus and organelles. And although there is just one type of erythrocyte, there are many types of leukocytes. Most of these types have a much shorter lifespan than that of erythrocytes, some as short as a few hours or even a few minutes in the case of acute infection.
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