First, a complete digestive system means that the digestive tract has a beginning or the oral end and the opposite end or the aboral end. This is found in more complex animals starting from roundworms (flatworms have an incomplete digestive tract). A closed circulatory system is found in animals more recent than mollusks. The presence of the coelom makes it more evolved than the flatworms.
Specifically, a small animal with a segmented body, short stiff appendages, and soft skin with the above characteristics point out to the phylum Annelida or annelids.
Though I cannot write this essay for you, I can provide some information to get you started on the relationship between ancestry and evolution.
<h3 /><h3>How are ancestry and evolution related?</h3>
Ancestry and evolution share a close relationship in that we can use one to learn about the other. Evolution can be <u>traced </u>using ancestry. By analyzing the genetic information of ancestral species and using information gathered about the environment in which they lived, we can deduce the impact of evolution on said species. One possible example is that penguins used to be capable of flight, but given their mostly aquatic environments, have evolved wings more suited for swimming, and lost the ability to fly as a result.
Therefore, we can say that ancestry and genetic information can be used to support the theory of evolution by examining how two species can be very different but share a common ancestor, and evolution can explain these changes.
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<span>If
the population is separated long enough, this means that random sampling in mating
and reproduction, that occurred in the
initial population has been restricted</span><span>. The two population will, therefore, adapt to
their local environments and become reproductively isolated
with time. After long periods of time, the two lizards population will have different
alleles and will not be able to mate and
produce viable offsprings hence will have
speciated.</span>
