In chemistry class, Roberto sees that traces of lithium makes a flame appear bright red. Roberto wonders if the presence of other elements also affects the color of a flame. Roberto’s friend tells him the color of a flame cannot be changed, but Roberto is still unsure. Roberto designs an experiment to test flame color in the presence of different elements.

1. senate

2.there is no diagram

3.education

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.

b) the bill goes to the president.

hope this