Glands regulate distant parts of the human body with hormones. The pancreas regulates the body with a hormone called insulin. A biologist wanted to discover the effects of insulin from the pancreas. The biologist altered the pancreases from 30 mice. The biologist kept another 30 mice unaltered. Then the biologist recorded the differences that developed between the mice in both groups. What method did the biologist perform to investigate the role of the pancreas?

1. pass through the cochlea, are transformed into nerve impulses and sent to the brain hair cells 2. forms in your outer ear and is meant to protect your ear from dirt and infection middle ear 3. receives sounds and sends them through the auditory canal to the eardrum inner ear 4. a thin membrane that transmits sound waves into the middle ear cerumen 5. where the cochlea is sound waves 6. a snail-shaped organ lined with hair cells cochlea 7. inside, small bones transmit sound waves from the eardrum to the inner ear eardrum 8. destroyed by extended exposure to loud noise outer ear