Across
1
Measure of matter in an object
3
Magnetic metallic element
4
Unit of heredity
5
Blocking of light by a celestial body
8
Group of similar cells
9
The Red Planet
10
Positive particle in nucleus
11
Basic unit of life
Down
1
Tissue that contracts for movement
2
Center of an atom or cell
6
Preserved remains of ancient life
7
Infectious microscopic agent