Across
1
Group of similar cells
2
Unit of force
4
Preserved remains of ancient life
5
Basic unit of life
6
Hottest planet in solar system
7
Biological catalyst
9
Tissue that contracts for movement
Down
2
Center of an atom or cell
3
Absolute temperature scale unit
8
Molten rock beneath Earth surface
10
Form of thermal energy
11
Unit of energy
12
Nerve cell in the brain
13
Naturally occurring inorganic solid