This is a slide of human cheek cells. After scraping the inside of their mouths, students in Ms. Gordon's class smeared the swab on a slide and stained them blue. These cells are parts of a large, complex organism, a human. But these cells. Like the other cells in the human body all have an important organelle, seen here. It stains dark blue and is the control center of the cell. What is this organelle? Question 13 options: DNA cytoplasm membrane nucleus.

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.

and after water is usually warmed by the sun the water temperature raises and then evaporates .

its temperature is increasing. this causes molecular vibrations to increase.