What causes an ionic bond?

When electrons are transferred from one atom to another, it is called an ionic bond. The condition needed to form the above bond is that the two molecules in the reaction must have opposite signs. This rule works like how magnets attract each other. If two atoms have different electronegativity values, they will form an ionic structure.

Explanation:

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: