横向
1
Ball of burning gas in space
4
Unit of heredity
6
Group of similar cells
8
Solid with repeating atomic pattern
10
Gas essential for breathing
11
Path of a planet around the sun
纵向
2
Push or pull on an object
3
Mass per unit volume
5
Our home planet
7
Measure of matter in an object
9
Curved glass that refracts light