Across
1
Nerve cell in the brain
4
Icy body with a tail near the sun
7
Positive particle in nucleus
8
Tissue that contracts for movement
Down
2
Precious yellow metallic element
3
Group of similar cells
5
Push or pull on an object
6
Disturbance that transfers energy
7
Particle of light
9
Basic unit of life
10
Magnetic metallic element