Ineed question 1 of science.
physical activity designed to increase your heart rate is called exercise, meaning “with oxygen.”

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

Group of elements with the same number of valence electrons

During the refrigeration cycle, what does the refrigerant do? absorbs and releases thermal energy by first vaporizing then condensing. absorbs and releases thermal energy by first condensing then vaporizing. insulates the thermal energy away from the cooling area. transfers thermal energy to the cooling area by condensing.