Organisms must maintain which is a balance of internal conditions.

homeostasis

To achieve homeostasis, individual cells are able to keep the amounts of molecules inside and out at certain levels. Many cellular activities require that this balance be maintained with the surrounding environment.

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: