Living things use many strategies for producing offspring, but most strategies fall neatly into the categories of either sexual or asexual
reproduction. Asexual reproduction involves a single parent. It results in offspring that are genetically identical to each other and to
the parent. All prokaryotes and some eukaryotes reproduce this way. Sexual reproduction involves two parents. During sexual
reproduction, parents produce reproductive cells, called gametes, that unite to form an offspring. Gametes are haploid cells. This
means they contain only half the number of chromosomes found in other cells of the organism. The chromosomes sort randomly
during the process of meiosis, each gamete receiving half the chromosomes from each parent. Gametes are united during the process
of fertilization.
Either type of reproduction will result in the continuation of a species, but one method results in genetic variation as well. Which of these
is NOT a reason why sexual reproduction better serves survival of the fittest and evolution of a species.
Random assortment of chromosomes increases genetic variation. An organisms may
get traits that aid in survival.
Sexual reproduction increases
the likelihood that a mutation
might take place in an
organism's DNA.
Sexual reproduction may reduce
the chances of inheriting a
genetically inherited disease of
condition
D)
Genetic variation may aid in removing undesirable traits or weakness from a
population and therefore aids in natural selection.

Ahaha ya ahaha ahaha ahaha

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.