A change in their food, from trees to grass in the Great Plains.
A. Abrasion
Reason - cause by scraps on rough surface which breaks skin on outer layer.
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Gene expression is the process by which the instructions in our DNA are converted into a functional product, such as a protein. When the information stored in our DNA? is converted into instructions for making proteins? or other molecules, it is called gene expression
Water enters the soil in a process called infiltration, and then moves downward through the soil in a process called percolation.