横向
1
Unit of heredity
3
Solid with repeating atomic pattern
5
Group of similar cells
8
Particle of light
9
Substance with pH below 7
10
Natural satellite of Earth
11
Push or pull on an object
12
Tissue that contracts for movement
纵向
2
Blocking of light by a celestial body
3
Icy body with a tail near the sun
4
Curved glass that refracts light
6
Second lightest element
7
Hottest planet in solar system