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Q. 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 schematic and pictorial representation of evolutionary relations among species of living beings in which the trunk (or a preceding branch) represents common ascendants of species and groups of living beings that are distributed along its branches according to hypothesis on their origin. For instance, today it is admitted that birds and mammals are two distinct branches of the same preceding reptile branch.
Biology cannot guarantee a definite evolutionary tree (phylogeny) on the species of living beings that live or have lived in our planet. There are many knowledge gaps and many data to be discovered to be filled. One of the mainly promising methods to study phylogeny is the comparison of DNA molecules from different groups of living beings researching similarities and differences in nucleotide sequences that may indicate less or more relatedness among species.
Adverse Effects of Imiquimod Application site reactions (irritation, pruritus, flaking, erosion) are generally mild to moderate in intensity and resolve within 2 weeks of cessa
Cotyledon is a leaf-like structure which is present in the seeds of the flowering plants; it appears during seed germination and sometimes is referred to as the seed leaf.
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Q. Why is the sun the "motor" of the water cycle? The sun can be considered the motor of the water cycle for the reason that upon its energy the transformation of liquid water
Leptontene: The chromosomes becomes visible, shorten and thick. The size of the nucleus increase. The homologous chromosomes start getting closer to each other. Z
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