How could a plant regulate the movement of carbon dioxide oxygen and water vapor into and out of the leaf?

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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the answer is :

the answer is c. altitude. hope this ! #brainiac