What type of organisms always occupy the fi rst level of an ecological pyramid or a pyramid of numbers?

Describe how gravity and convection work together to move the plates in the plate tectonics theory

What contributions did muslims make to astronomey

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.