Across
1
Nerve cell in the brain
4
Infectious microscopic agent
5
Our home planet
6
Solid with repeating atomic pattern
7
Unit of force
9
Precious yellow metallic element
Down
2
Curved glass that refracts light
3
The Red Planet
5
Biological catalyst
6
Icy body with a tail near the sun
8
Group of similar cells
9
Unit of heredity
10
Smallest unit of an element