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Mitochondria, for example, are organelles that provide eukaryotes with most of their energy by producing energy-rich molecules called ATP. Prokaryotes lack mitochondria and instead produce their ATP on their cell surface membrane.
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A formal region may be characterized by human-centered properties, such as a common language or a common political system, or by physical properties, such as a particular land form or vegetation.
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components of culture include symbols, language, values, beliefs and norms. Symbols may be either physical or non-physical.
I think it's letter B. When an object freezes, such as ice, their molecules will be contracted due to the molecules that looses kinetic energy. When there is a lose of kinetic energy, then the temperature is cold. So the answer is contraction because it causes the molecules to freeze.<span />
