Anyone knows thisss???

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

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.

How can an organ, such as the lungs, work for multiple body systems?