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is scientific knowledge established through direct observation and remains constant. scientific knowledge can change when
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Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

The answer is nitrogen-containing bases

Answers are 1,2,4 its correct on edgenuity.

Ibelieve the answer is weathering,hope my answer has you : )