Why the number of atoms of reactants must equal the number of atoms of products formed

Because of the Law of Conservation of Matter  

Explanation:

The Law states that matter cannot be destroyed or created.

Atoms are made of matter, so all a chemical reaction can do is rearrange the atoms in different ways.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

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