Why do hibernating animals wake up in the spring?

What words in the preamble to the constitution reflect the principle of popular sovereignty

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?

Aryans believed that the most important thing in life was warfare. if this statement is true, which of the following facts best supports it?