There are 159 saguaro cactus plants per square kilometer in 10-square-kilometer area of arizona desert. to which population characteristic does this information refer?

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:

a = executive branch; b = judicial branch