That would be erosion. I know this because i spent years studying rocks and had straight passed all of it. Hope this helps. ;)
There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life.
Valence shell
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
The decrease is sunlight would affect the plant population because plants use sunlight as energy witch help them live and grow and without plants some animals do not have food to survive the winter
