What is the role of a primary consumer in an ecosystem?

The image shows embryos of three vertebrate classes

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

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