How many organ systems are found in the human body a.4 b. 5 c.11 d.15

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:

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.