The process of selective breeding

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.

Fill in the blank a scientific theory become a scientific law because only offer descriptions of the natural world, while offer robust explanations. 1. a) cannot b) can 2. a) laws b) theories 3. a) laws b) theories

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