Guenevere tells her partner, "i bet if we give the kids stickers for brushing their teeth very well, they'll do a better job before bed! " guenevere has made a hypothesis about the tooth-brushing behaviors.

A simple hypothesis.

A simple hypothesis is one that predicts the behaviour between two variables: the independent and the dependent variable.

In this case, Guenevere's hypothesis is that, if a reward is provided, the quality of brushing will be improved.

This could turn into an empirical hypothesis if they decided to test it in real life.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.