It help conserve energy so that in summer they can stay healthy. Also alows them to eat a buch of food and it not be so much
Which activities? I want to say the nucleus as it is the control center of the cell, but this is a vague question.
Plates of the earth's crust that move apart cause earthquakes.
material culture includes all of the physical objects that people create and give meaning to. Cars, clothing, schools, computers, and books would be examples. An object only becomes part of culture after meaning have been given to it. A rock in a field has no meaning until it is used as a tool or to build a fence.