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