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The tree topology
The lengths of the branches
The branching order of the tree
Nucleotide substitution rate
These would not affect maximum likelihood estimates of phylogenies when comparing different tree hypotheses.
<h3>What is tree topology?</h3>
- A unique kind of structure called a tree topology has numerous connected parts arranged like the branches of a tree.
<h3>The lengths of the branches:</h3>
- Branch lengths are a sign of genetic divergence; the longer the branch, the more genetic divergence has taken place.
- Usually, we calculate the average number of nucleotide or protein substitutions per site to assess the degree of genetic alteration.
<h3>The branching order of the tree:</h3>
- The topology of a tree refers to its branching structure.
- Species (or higher taxa), populations, genes, and proteins are examples of taxonomic units that the nodes represent.
- A branch is referred to as an edge, and it represents an estimate of the length of time between the evolutionary relationships between taxonomic units.
<h3>What is nucleotide substitution rate?</h3>
- The instantaneous rate of change from each of the four nucleotides to each of the other four nucleotides is summarized in the nucleotide substitution rate matrix.
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Group IV of the Periodic Table of the Elements contains carbon (C), silicon (Si) and several heavy metals. Carbon, of course, is the building block of life as we know it. So is it possible that a planet exists in some other solar system where silicon substitutes for carbon? Several science fiction stories feature silicon-based life-forms--sentient crystals, gruesome golden grains of sand and even a creature whose spoor or scat was bricks of silica left behind. The novellas are good reading, but there are a few problems with the chemistry.
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CRYSTALLINE CREATURES? Silicon can grow into a number of lifelike structures, but its chemistry makes it unlikely that it could be the basis for alien life-forms.</span>
Indeed, carbon and silicon share many characteristics. Each has a so-called valence of four--meaning that individual atoms make four bonds with other elements in forming chemical compounds. Each element bonds to oxygen. Each forms long chains, called polymers, in which it alternates with oxygen. In the simplest case, carbon yields a polymer called poly-acetal, a plastic used in synthetic fibers and equipment. Silicon yields polymeric silicones, which we use to waterproof cloth or lubricate metal and plastic parts.
Answer: C. Levy taxes to pay the nations debts
Explanation:
yes
