What are these eight words associated with?

Roots and rhizomes: methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl 1, octyl, nonyl, nonyl, nonyl and decyl (gui3)

Twelve earthly branches: Zi Chou Yin (Yin) Mao (Chen) Si (Si) Wu Shen (Shen 1) You 3) Xu 1) Hai (Hai 4).

The simplest earthly branches are rats, ugly cows, tigers, rabbits, dragons, snakes, afternoon horses and sheep. . . . . Recite the zodiac and you will know.