I can't see the question because it is blurry. I am sorry...
Answer:
im pretty sure a mountain
Explanation:
im like 95% sure but hey this is better than nothing
The immune system<span> is the body's defense against infectious organisms and other invaders. ... One of the </span>important<span> cells involved are white blood cells, also called leukocytes, which come in two basic types that combine to seek out and destroy disease-causing organisms or substances.</span>
Short, fast sprint
Explanation:
During the short period of the fast sprint, the muscles are demanded to act really fast and are therefore exerted because there is little time for oxygen to diffuse into the tissue and satisfy the energy needs of the muscles. The energy demand is higher than the oxygen supply. Therefore cellular respiration of the cells of the tissue incline towards anaerobic respiration (glycolysis in the cytoplasm). This fast pace can't be sustained because glycolysis is an inefficient way of generating energy by cells. Pyruvate, the end product is converted into lactic acid. Accumulation of lactic acid causes muscle spasms.
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