When were the earliest tidal mills built on the coasts of spain, france, and great britain?

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?