Which vitamin is produced in the human body when exposed to sunlight?

Which blood type is known as the universal donor?

How many bones are in the adult human body?

Which of the following is a non-renewable energy source?

What is the pH value of pure water?

Which part of the plant conducts photosynthesis?

Which is the most abundant metal in the Earth's crust?

Which gas is responsible for the greenhouse effect?

Which part of the brain controls balance and coordination?

Which unit is used to measure electrical resistance?