Which is an example of a metallic bond

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

Water diffusing through a semipermeable membrane is called

Electrochemical cells provide energy by allowing electrons to flow through an external circuit to electrodes contained in an electrolyte