According to momentary maximization theory, in a concurrent vi vi situation, a subject will

I believe the answer is: switch from one response alternative to the other and reinforcer delivery

According to the maximization theory, individuals would always make an effort to obtain better alternatives for themselves. So, in a concurrent situations , people tend to switch to the alternative that they see as 'better' and reinforce some sort explanation in their main to justify their action.

what words? are you talking about to complet what sentence

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.