500 years ago, how many children died before the age of 5 due to disease?

Which osmotic and ionic strategies must marine teleost fishes employ?

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

Match each symbol with its description.