Which process made an increase in chemical energy for cell activities in organisms living on the earth possible

Metabolism is the process that is responsible for an increase in chemical energy for cell activities in organisms living on the earth possible.

Explanation:

Metabolism is the set of the chemical reactions that occurs in the living cells. All the living organisms needs some energy for growth and reproduction. Metabolism is the process that continues the chemical process in the organisms and activates the organisms to convert the chemical energy that stored in the molecules into other form of energy which can be used for the cellular process.  

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.