Can some one help me with this question its hard :( down below ill give brainliest and plz explain ;-;

Rank the following from most to least devasting: ordovician,permaian,cretaceous, pleistocene

Francisco loves to learn, but his lack of english makes him feel “nervous and scared.” why is he both happy and scared of school

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment.b. the allocation of resources between private markets and the public sector.c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t.d. differences in productivity.e. ones that think at the margin and respond to incentives and those that don’t.