Lack of political unity within Greece resulted in frequent conflict between Greek states. The most devastating intra-Greek war was the Peloponnesian War (431404 BC), won by Sparta and marking the demise of the Athenian Empire as the leading power in ancient Greece. Both Athens and Sparta were later overshadowed by Thebes and eventually Macedon, with the latter uniting the Greek world in the League of Corinth (also known as the Hellenic League or Greek League) under the guidance of Phillip II, who was elected leader of the first unified Greek state in history.
What often caused strife between Greek states?
Lack of political unity

Migration in birds is highly labile and is believed to have developed independently in many avian lineages. While it is agreed that the behavioral and physiological adaptations necessary for migration are under genetic control, some authors have argued that no genetic change is necessary for migratory behavior to develop in a sedentary species because the genetic framework for migratory behavior exists in nearly all avian lineages. This explains the rapid appearance of migratory behavior after the most recent glacial maximum.
What exists in nearly all avian lineages?
genetic framework for migratory behavior

Some scholars and organizations disagree with the notion of "separation of church and state", or the way the Supreme Court has interpreted the constitutional limitation on religious establishment. Such critics generally argue that the phrase misrepresents the textual requirements of the Constitution, while noting that many aspects of church and state were intermingled at the time the Constitution was ratified. These critics argue that the prevalent degree of separation of church and state could not have been intended by the constitutional framers. Some of the intermingling between church and state include religious references in official contexts, and such other founding documents as the United States Declaration of Independence, which references the idea of a "Creator" and "Nature's God", though these references did not ultimately appear in the Constitution nor do they mention any particular religious view of a "Creator" or "Nature's God."
What do these critics argue couldn't have been intended by the framers of the constitution?
prevalent degree of separation of church and state