How many types of microscopes are there?

What is hydroelectric power produced by?

Why does the skin of your finger shrink when you wash clothes for a long time?

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream