1. The heart muscle cells need plenty of oxygen and nutrients so it needs its own blood supply.
2. The heart needs to have a blood supply to get ride of wastes.
Hope that helps. -UF aka Nadia
As continents drift apart, it becomes hard for a population to
mingle freely due to geological separation.
This restricts the gene flow in the once homogenous population hence resulting in the allopatric
speciation of the separated groups of the population. Also, as the continents drift, their climate changes and so does the flora and fauna in the process of
adaptation.
Given that the main reason for which an artist will retrace a drawing in pen is to <u>correct errors </u>and achieve a <u>final draft</u>, we can compare this to the biological process of DNA proofreading.
DNA proofreading is a <u>biological process </u>that takes place during the biosynthesis of DNA. During this time, a chain of <u>DNA </u>is read and a complementary chain is creating, <u>effectively duplicating the genetic code</u>.
During this process, DNA proofreading takes place. This is described as a process in which the DNA polymerase retraces the genetic code, detecting and fixing any errors in the synthesis before the strand is closed once again.
The fact is that both processes, despite taking place in astronomically different situations, share a final goal which is to prepare the "product" for the "final draft". This allows us to draw <u>valid</u> <u>comparisons </u>between the retracing of a <u>cartoon </u>and the <u>proofreading </u>of <u>DNA </u>by the DNA polymerase enzyme.
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