Well I have no actual study on this but, it looks like what your homework might really wants is an opinion;so let's give them one shall we? I think the way control would be maintained is by power & intellect. Why? because those two characteristics in a being would grant them respect. This answer is also most likely because, umm hello, it's a tribe lol, means they are dirt broke hehe. So greed doesn't really get in the way like in our government. The Short Answer is This : They pick a leader, with the previously stated characteristics.... Well & obviously he needs some niggaz to back him up in a fight, if some haters try to overthrow him. =D
Relatively simple changes in Hox genes control limb formation in tetrapods.
Feedback control of the adrenal cortex.
A wastegate is used on the first-generation Duramax diesel to control maximum boost pressure.
Internal and External Loci of Control
Birth Control Methods and Abortion
Phrenology model showing areas of the head overlaying brain regions that control different traits. I