Across
1
Element found in all living things
2
Nerve cell in the brain
3
Group of similar cells
9
Blocking of light by a celestial body
10
Compound containing oxygen
Down
2
Unit of force
4
Measure of matter in an object
5
Path of a planet around the sun
6
Biological catalyst
7
Solid with repeating atomic pattern
8
Hottest planet in solar system