Across
1
Nerve cell in the brain
3
Basic unit of life
4
Reddish electrical conductor
6
Measure of matter in an object
8
Particle of light
9
Hottest planet in solar system
10
Blocking of light by a celestial body
Down
1
Center of an atom or cell
2
Disturbance that transfers energy
3
Element found in all living things
5
Biological catalyst
7
Positive particle in nucleus
11
The Red Planet