Question

She knows his secret now, the wild, light, slender bird that floats and wavers, and goes back like an arrow presently to his home in the green world beneath. Which part of this sentence from "A White Heron" is a simile?

Answer 1

"like an arrow presently to his home in the green world beneath"

Answer 2

A simile uses like or as when comparing something.
 the phrase "goes back like an arrow" is a simile.