What is the summary of the section "We Need Better Batteries"?

Ido believe it is b 

Answer(apex)  ok i looked up two diff, sites both say the answer is a technological innovation that has allowed people to adapt to living in hot climates, plz check first good luck///

The shia sect of islam is primarily different from sunni islam in the belief that the first legitimate imam following muhammad was imam ali. unlike the three caliphs that succeeded muhammad, ali was part of muhammad's clan (related to him). major shia caliphates include the fatimid and safavid caliphates.  the answer will be option c. shia read more on

Earth is passing saturn in its orbit, with both planets on the same side of the sun