Which system carries messages between the brain and body?

Which blood vessels carry blood back to the heart?

What is the main function of red blood cells?

Which organ in the human body produces bile?

Which part of the plant conducts water from roots to leaves?

What is the process by which plants release water vapor into the air?

Which organelle in cells is known as the 'powerhouse'?

Which body system defends against infections?

Which process creates offspring identical to the parent?

What type of blood cells help clotting when injured?

What do we call molten rock beneath Earth's surface?

Which layer of Earth is made of solid rock and tectonic plates?

Which planet is called the 'giant red spot' planet?

What is a naturally occurring event caused by movement of tectonic plates?

Which tool is used to measure air pressure?

Which planet is closest to the Sun?

What is the spinning motion of Earth called?

What is the galaxy in which Earth is located?

What causes day and night?

What is a group of stars forming a pattern called?

What type of energy is stored in food and fuel?

What happens to particles when a solid turns into a liquid?

Which simple machine is an inclined plane wrapped around a cylinder?

What is the force that pulls objects toward Earth?

Which type of energy is produced by moving electrons?

Which property of matter is measured in grams?

What is a material that does not allow electricity to pass through?

What form of energy makes objects warm?

What is the upward force that makes objects float in water?

Which tool is used to measure force?