Science

Which of the following is a renewable source of energy?

• Coal

• Natural gas

• Petroleum

• Wind energy

What is the boiling point of water at sea level?

• 50°C

• 75°C

• 100°C

• 150°C

Which gas is essential for respiration?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

What do green plants make during photosynthesis?

• Carbon dioxide

• Water

• Oxygen

• Protein

How many legs does an insect have?

• 4

• 6

• 8

• 10