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