What element makes protein different from carbohydrate and fat? select one: a. hydrogen b. oxygen c. carbon d. nitrogen?

What is the molality of a solution that has 4 mol of kci in 0.800 kg of water

Apump contains 0.5 l of air at 203 kpa. you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Which type of fossil does this image depict?