The student set up the polometer under Ihree diarent
conditions
A no wind at 15 °C
B no wind at 25 °C
C wind at 25
°C
For each investigation the
student measured how far the
air
bubble moved along the scale
in 2 minutes.
Name the two independent
variables the student
investigated.
Name two variables that

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.

a physical change is being made.