What type of land use is not influenced by human activity

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?

1. describe the concept of the unitary executive. discuss whether this concept is practical.

For an actor, keeping his mind on will ultimately his performance.