What environmental callenges arise when one endeavors to remove a dam? (Full sentences please)

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.

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

In the sentence "a mining company will consider the distribution of coal when deciding how to mine the coal," what does the word distribution mean?