What planet is known as the "Red Planet"?

What gas do plants absorb from the atmosphere?

What part of the plant conducts photosynthesis?

How many bones are in the adult human body?

What force pulls objects toward Earth?

Which planet is closest to the Sun?

What is the main source of energy for life on Earth?

What vitamin do we get from sunlight?

Which scientist developed the theory of relativity?

What gas do humans exhale?