Which simple machine is used in a pair of scissors?

Which common acid is found in citrus fruits like lemons and oranges giving them a sour taste?

Which essential mineral is critical for oxygen transport in the blood as a key component of hemoglobin?

Which fluid lubricates joints and reduces friction between bones during movement?

Which everyday substance when mixed with water forms a solution that conducts electricity?

Which organ in the human body is primarily responsible for filtering blood and removing waste?

Which device is used in submarines to see objects above the water surface without surfacing?

Which gas do plants primarily absorb during photosynthesis?

Which acid in the stomach helps in the digestion of food and kills harmful bacteria?

Which gas makes up approximately 21 percent of Earth's atmosphere and is essential for respiration?

Which force is primarily responsible for keeping planets in orbit around the sun?