HELP PLZ

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

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.

There are only about 250,000 known fossil species. true or false