Explain how a piece of silver and a silver necklace can illustrate a physical change.

A chemical change is when the matter changes permanently, and a physical change is when a matter changes entirely. The best answer is when the metals melt and harden again

you are the source of the heat energy. you can minimize the heat energy by selecting the appropriate clothes to wear.

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.