What is a secondary disturbance

Depression

Explanation:

The primary disturbance comes before Secondary disturbance. During the first stage, issue is not much given thought until it graduate into a more pressing life threatening issue which is the secondary disturbance.

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answer; i believe the correct answer to the above question is ( friction)

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: