The correct answer would be D, gravity. As moving water will cause rocks to erode as well as wind, and animal habitation.
A. Liquids
The earth’s outer core is a fluid layer approximately 2,400km thick
The hybrid zone may change depending on the fitness strength and the reproductive barriers of the hybrids.
Today in Biology my teacher discussed about Meiosis & sperm cells the other choices were not involved. I would choose that one as it being a reproductive cell.
The graph table population is continuously increasing until 2007
