A mutation that can change one codon coding for an amino acid into a codon that doesn't code for any amino acid is a. non sense mutation
b. mis sense mutation
c. frameshift mutation

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.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.