1. Explain why most cells are, of necessity, very small.

they need to divide when they grow beyond a certain limit.

Explanation:

they may not have not enough material to cross the membrane quick enough which will increase cellular volume. when that happens the cell must divide into smaller cells with favorable surface area or volume ratios or crease in function. hoped that helped. :)

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.

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explanation: