横向
1
Gas essential for breathing
5
Element found in all living things
7
Basic unit of life
8
Hottest planet in solar system
9
Preserved remains of ancient life
11
Reddish electrical conductor
12
Tissue that contracts for movement
纵向
2
Unit of heredity
3
Nerve cell in the brain
4
Center of an atom or cell
6
Substance with pH below 7
10
Unit of energy
13
Path of a planet around the sun