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.

Which type of wave can travel without a medium

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

What is the period of a wave traveling 5 m/s if its wavelength is 20 m/s