横向
1
Precious yellow metallic element
4
Positive particle in nucleus
5
Unit of heredity
6
Center of an atom or cell
8
Unit of energy
9
Smallest unit of an element
12
Ball of burning gas in space
纵向
2
Mass per unit volume
3
Nerve cell in the brain
7
Form of thermal energy
10
Substance with pH above 7
11
Element found in all living things