Across
1
Form of thermal energy
4
Positive particle in nucleus
5
Group of similar cells
6
Infectious microscopic agent
8
Unit of heredity
Down
2
Substance with pH below 7
3
Push or pull on an object
6
Hottest planet in solar system
7
Nerve cell in the brain
9
The Red Planet
10
Tissue that contracts for movement
11
Reddish electrical conductor