The immune system<span> is made up of a network of cells, tissues, and organs that work together to protect the body. One of the important 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>
<span>When an athlete is nearing the end of a race and her cells are low on oxygen, it is likely to be fermentation. When cells have used up all their oxygen they ferment glucose into lactic acid. Fermentation is a metabolic process that consumes sugar in the absence of oxygen</span>
2 - Human refuse to stop polluting.
All other three are attempting to attack the problem of pollution.
Answer: I think the Answer is that the moon will rise at 7Pm and set over the peach tree in her garden.
Burning fossil fuels releases carbon dioxide and causes global warming
