Answer:
C. Gene trees are only useful studying the relationships of sequences from different species.
Explanation:
Gene tree traces the evolutionary history of a particular gene. It includes all the events like duplication and speciation. It helps to study the relationship of genes from different species. Often these are orthologous genes which came form the same ancestor and code for the same protein indifferent species. Gene tree also helps to study the relationship of genes in the same species. Often these are paralogous genes which evolved by duplication and code for similar but not identical proteins in the same species. Hence, the statement that gene trees are only useful for studying the relationships of sequences from different species is incorrect.
Answer:
I believe that A is the answer
Organisms usually rely on fermentation if they are small since fermentation produces little energy and it is not enough for larger organisms' highly complicated processes. In addition, it occurs usually as a last resort when nothing else works.
(4) D and E are products of digestion
Answer:
It's electron structure.
Explanation: The valence levels and the amount of electrons allows for the covalent bonding with multiple other elements.
