Biology Questions and Answers
notochord of the embryonic stage is
substituted by adults. the vertebral column in
- What are the five classes
of vertebrates? To which of
these do human beings
belong?
The five classesfishes (osteichthy of vertebrates ares and e:
chondrichthyes), amphibians, reptiles,
birds anmammals.d mammals. Humans classify as
- What is an evolutionary
tree? Is there a precise
evolutionary tree known by
science that explains the
emergence and origin of every
type of living being?
Evolutionary tree is the pictorial and
schematic reevolutionary presentation orelations among species of (^) f
living beings in which the trunk (or a
preceding branch) rascendants of species aepresents commnd groups ofon
living beings that are distributed along
its branches accorditheir origin. For example, today it isng to hypothesis on
admitted that birds and mammals are
two distinct branches of the samepreceding reptile branch.
Biology evolutionary cannot assurtree (phylogeny) on thees a definite (^)
species of living beings that live or have
lived in our planet. There are many dto be discovered and many knowledgeata
gaps to be filled. One of the most
promising methods to study phylogeny
is the comparisofrom different groups on of DNA molf living beingsecules (^)
researching similarities and differences
in nucleotide indicate more or less relatedness amongsequences that may (^)
species.
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