Across
1
Center of an atom or cell
5
Substance with pH below 7
6
Tissue that contracts for movement
9
Magnetic metallic element
Down
2
Precious yellow metallic element
3
Naturally occurring inorganic solid
4
Measure of matter in an object
7
Group of similar cells
8
Nerve cell in the brain
10
Basic unit of life
11
Path of a planet around the sun