横向
1
Unit of heredity
4
Icy body with a tail near the sun
5
Tissue that contracts for movement
7
Unit of electric potential
8
Smallest unit of an element
纵向
2
Gas essential for breathing
3
Group of similar cells
6
Tectonic landmass section
Unit of heredity
Icy body with a tail near the sun
Tissue that contracts for movement
Unit of electric potential
Smallest unit of an element
Gas essential for breathing
Group of similar cells
Tectonic landmass section