Why is some cholesterol necessary for animal cell membranes but high cholesterol levels are dangerous?

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

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?

Amap's orientation is typically determined by an