In this exercise we used global distributions of dinosaurs. How might the FADs and LADs differ if we focused on dinosaurs within a certain region (e. g., North America, South America, etc)? What about if we used genus or species-levels instead of the suborder groups? Saurischian vs ornithischian? (

Temperature, rainfall and relative humidity.

The area they r in. this  the answer.

The first immigrants to settle in what is now the united states were the ancient ancestors of modern native americans. the precise routes of those first north american immigrants are disputed, but there is no uncertainty about the fact that every human being on the continent is either a recent immigrant or a descendant of earlier immigrants. since the first immigrants came here from asia more than thirteen thousand years ago, there have been four large and easily recognizable modern waves of immigrants into the united states.

Answer commensalism