What is the difference between heat exhaustion and heat stroke?

heat exhaustion is a decrease in blood volume, while heat stroke is an increase in blood volume.
heat exhaustion is an increase in blood volume, while heat stroke is a decrease in blood volume.
heat exhaustion involves extreme sweating, while heat stroke involves a lack of sweating.
heat exhaustion involves a lack of sweating, while heat stroke involves extreme sweating.

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

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Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?