A squirrel sees a cat and runs up a tree, is this an example of internal or external stimuli? PLEASE HURRY

External

Explanation:

Because it is a change outside the body, or knowledge that is passed through our senses.

Hope this helps!!!

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.