Across
1
Tissue that contracts for movement
4
Biological catalyst
5
Particle of light
7
Preserved remains of ancient life
10
Precious yellow metallic element
11
Substance with pH below 7
Down
2
Unit of force
3
Chemical element in table salt
4
Blocking of light by a celestial body
6
The Red Planet
8
Unit of electric potential
9
Group of similar cells