How do parasitic flatworms evade their host's immune system?

They have a special skin that camouflages them and the immune system will see them as its own self instead of an invader. The skin also protects them from digestive enzymes. 

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.

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