Askin rash that neither itches nor burns is a symptom of which stage of syphilis?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down

What two conditions must be present for osmosis to occur?