What is the primary component of natural gas?

Which organ produces insulin and regulates blood sugar levels?

Which of the following is a strong acid?

What is the name of the region in space beyond Neptune, populated by small icy bodies, including Pluto?

Which layer of the Earth is responsible for the convection currents that drive plate tectonics?

Which law of thermodynamics states that heat energy always flows from areas of higher temperature to areas of lower temperature?

What is the chemical symbol for sodium?

Which of the following is an example of a homogeneous mixture?

What is the main function of red blood cells?

Which type of energy is associated with the motion of an object?