Across
1
Group of similar cells
5
Disturbance that transfers energy
6
Preserved remains of ancient life
8
Tectonic landmass section
9
Center of an atom or cell
12
Reddish electrical conductor
Down
2
Mass per unit volume
3
Solid with repeating atomic pattern
4
Gas essential for breathing
7
Substance with pH above 7
10
Substance with pH below 7
11
Tissue that contracts for movement