Across
1
Tissue that contracts for movement
3
Element found in all living things
5
Unit of heredity
6
Mass per unit volume
Down
1
Natural satellite of Earth
2
Tectonic landmass section
3
Icy body with a tail near the sun
4
Hottest planet in solar system
7
Particle of light
8
Curved glass that refracts light
9
Gas form of a liquid