Which of the following represents an endothermic reaction? Select one:

a. S(s) +O2(g) → SO2(g) ΔH = -297kJ

b. 2NO2(g) → N2(g) + 2O2(g) + 33.8kJ

c. N2(g) + 2O2(g) + 90.4kJ → 2NO2

d. N2H4(g) + O2(g) → N2(g) +2H20(g) + 627.6 kJ

Someone, part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer. justify how this compound was created from a recycling of carbon in the carbon cycle. use complete sentences to explain your answer.

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering