Which of the following regions had humans first? A. Asian plains B. African plains C. European plains D. North American plains​

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.

`stare decisis is a legal doctrine that obligates courts to follow historical cases when making a ruling on a similar current or future case. stare decisis ensures that cases with identical facts be approached in the same way, unless overruled by the same court or a higher court such as the us supreme court. simply put, it binds courts to follow legal precedents set by previous decisions.

stare decisis is a latin term meaning "to stand by that which is decided".