Deana is studying the table shown here, which lists the birthrate and death rate for several countries. Deana applies the data in the table to calculate the rate of population increase or decrease of each country.
Which assumption is necessary for Deana’s calculations to be accurate?

(A) The immigration and emigration rates of the countries are insignificantly small or approximately equal.

(B) The immigration rates of the countries are much higher than the emigration rates.

(C) The immigration rates of the countries are much smaller than the emigration rates.

(D) The population is evenly distributed between rural, suburban, and urban areas.

(E) The population of Italy is mostly urban, while the populations of other countries are mostly rural.

PART TWO:

Which conclusion is MOST strongly supported by the data in the table?

(A) The population of each country is increasing at approximately the same rate.

(B) The population of each country is increasing at different rates.

(C) Nutrition, sanitation, and medical care are about the same in each country.

(D) All of the countries except Italy have passed through the demographic transition.

(E) Italy has passed through the demographic transition, while the other countries have
not yet passed through it.

Mantle convection  is the slow  creepingmotion of earth's solid silicate  mantle  caused by  convection  currents carrying  heat from the interior  to the planet's surface.[1][2]  the earth's surface  lithosphere, which rides atop the  asthenosphere  (the two components of the  upper mantle), is divided into a number of  plates  that are continuously being created and consumed at their opposite  plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with  seafloor spreading. this hot added material cools down by  conduction  and  convection  of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of  subduction  usually at an  ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4]  while in other regions, this material is impeded from sinking further, possibly due to a phase transition from  spinel  to  silicate perovskiteand  magnesiowustite, an  endothermic reaction.[5]the subducted oceanic crust triggers  volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6]  and  mantle plumes.[7]it is because the mantle can convect that the  tectonic plates  are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the  hadean  period, resulting in gravitational sorting of heavier molten  iron, and  nickel  elements and  sulphides  in the core, and lighter  silicate minerals  in the  mantle.

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