Across
1
Substance with pH below 7
2
Unit of heredity
3
Chemical element in table salt
6
Preserved remains of ancient life
8
Magnetic metallic element
9
Infectious microscopic agent
10
Nerve cell in the brain
11
Hottest planet in solar system
12
Precious yellow metallic element
Down
2
Force that attracts objects together
4
Curved glass that refracts light
5
Positive particle in nucleus
6
Push or pull on an object
7
Tissue that contracts for movement
10
Center of an atom or cell