Across
1
Group of similar cells
4
Path of a planet around the sun
7
Biological catalyst
8
Hottest planet in solar system
9
Nerve cell in the brain
11
Amplified beam of light
Down
2
Chemical element in table salt
3
Push or pull on an object
5
Tissue that contracts for movement
6
Naturally occurring inorganic solid
8
Infectious microscopic agent
10
Blocking of light by a celestial body
12
Icy body with a tail near the sun