All I know is that stem cells are made in the bone marrow, and they differentiate into red blood cells
Answer: D. gully erosion
Rill erosion can eventually evolve into gully erosion. Gully erosion happens when runoff concentrates are flowing in a very strong manner causing it to move some of the soil particles. Advanced rill erosion can become a gully erosion.
The body system that directly provides for this demand is the circulatory system. When you exercise, the circulatory and muscle system cooperate, in order to meet the increased needs for strength and energy. The circulatory system involves the network which delivers blood to every part of your body. This flowing of blood ensures that the tissues are oxygenated and rich in necessary nutrients. During exercise, more blood flows to and from your muscles, in order to deliver the necessary amounts of oxygen to complete the aerobic respiration.
Answer:
D
Explanation:
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