What kinds of “invisible” hazards do they face in the mines?

What does all of the organ system in a human form

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?