What force keeps us on the ground?
What vitamin do we get from sunlight?
Which organ pumps blood through the body?
What is the chemical symbol for water?
Which gas is most abundant in the Earth’s atmosphere?
What planet is known for having a tilted rotation axis?
What gas do plants absorb from the atmosphere?
What is the process by which plants make food?
What part of the cell contains DNA?
What is the center of an atom called?
