Chemical messengers that are produced in one location in the body, released into the blood, and travel to other locations, where they elicit responses

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

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

Is there any solid scientific evidence that humans have been cloned?