横向
1
Biological catalyst
4
Basic unit of life
5
Compound containing oxygen
6
Center of an atom or cell
7
Our home planet
8
Positive particle in nucleus
11
Mass per unit volume
纵向
2
Tissue that contracts for movement
3
Unit of heredity
5
Gas essential for breathing
9
Blocking of light by a celestial body
10
Ball of burning gas in space
12
Icy body with a tail near the sun