Which type of cloud is often associated with thunderstorms and severe weather?

Which of the following blood vessels carries oxygenated blood from the lungs to the heart?

In the human reproductive system, what is the function of the ovaries in females?

In the human respiratory system, where does gas exchange with the bloodstream occur?

What is the process by which cells break down glucose to produce energy in the absence of oxygen?

What is the purpose of the mucus in the digestive system?

In the human respiratory system, what structure prevents the entry of food into the trachea?

What is the term for the process by which water returns to the Earth's surface from the atmosphere in the form of rain, snow, sleet, or hail?

What is the main driver of surface ocean currents?

What is the primary function of the pancreas in the digestive system?