I need help with this

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.

Closing romer’s gap. what is the significance of the new fossil evidence found in scotland? answer in claim evidence and reasoning

Aglacier retreats, exposing bare rock and allowing communities of organisms to move in. this is an example of