What is the function of the thymus gland in the immune system?

What is the process by which rocks are broken down into smaller particles over time?

What is the term for the outermost layer of a star's atmosphere, visible during a total solar eclipse as a halo of light?

Which organ is responsible for filtering and removing waste products from the blood?

What is the main function of red blood cells?

Which layer of the Earth's atmosphere is characterized by the presence of the ionosphere and where auroras occur?

In the periodic table, which group do the noble gases belong to?

Which blood vessels carry blood away from the heart?

Which of the following is a function of the liver?

What is the primary source of energy for the Earth's climate system?