7. Which of these elements would not be found in a carbohydrate? a. Hydrogen
b. Carbon
C. Nitrogen
d. Oxygen

Nitrogen

Explanation: It is the major atom that is present in amino acids that are not present in carbohydrates.

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.

not sure if this is what you'r looking for eubacteria and archaebacteria