Which part of the human eye controls the amount of light entering it?

Which planet in the solar system is known as the Red Planet due to its iron oxide rich surface?

Which part of the human body regulates temperature through sweating and blood vessel dilation?

Which common gas leak hazard in homes is often detected by its distinctive rotten egg smell added intentionally for safety?

Which type of wave requires a material medium to travel and cannot propagate through vacuum?

Which simple machine is used in a pair of scissors?

Which cell organelle is often referred to as the powerhouse of the cell due to its role in energy production?

Which natural process explains how mountains gradually wear down over long periods of time?

Which type of lens is used to correct hyperopia or farsightedness?

Which gas is commonly used to fill balloons so that they float in air?

Which natural phenomenon produces colorful displays of light in polar regions due to solar particles interacting with the atmosphere?