Blood is a unique type of connective tissue that we haven't been able to synthetically create yet. For that reason donating blood is so essential to maintain the health of our population. If you are type O- blood, explain (in your words) the benefits and risks of being O-. Also, explain the differences between O+ and O- blood types.

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.

helicase, i think thats it