Why is the pancreas considered part of the endocrine system

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

In which layer do organisms on earth love?

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid