Across
1
Tissue that contracts for movement
5
Magnetic metallic element
6
Gas essential for breathing
7
Absolute temperature scale unit
8
Path of a planet around the sun
11
Biological catalyst
13
The Red Planet
Down
2
Our home planet
3
Second lightest element
4
Naturally occurring inorganic solid
9
Unit of heredity
10
Chemical element in table salt
12
Disturbance that transfers energy