Which type of wave does light represent in terms of its propagation?

Which gland produces saliva to aid in the initial digestion of food in the mouth?

Which vitamin deficiency commonly causes the disease scurvy?

Which planet is known as the Blue Planet due to its large amount of surface water?

Which everyday hygiene practice is most effective in preventing the spread of common cold and flu viruses?

Which scale is commonly used to measure the intensity of hurricanes and tropical cyclones?

Which organ produces bile that aids in the digestion of fats?

Which gas exchange membrane structure in the lungs maximizes surface area for efficient breathing?

Which photoreceptor cells in the eye are responsible for vision in dim light and cannot distinguish colours?

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

What is the approximate speed of light in a vacuum?