Read this paragraph and answer the following question about it:
A scientist in Northern California is studying the tree rings of a very old redwood tree. He notices that the oldest tree rings are very narrow. As the rings move away from the center, he observes 15 rings that get wider and wider.

What can you determine about the climate during the 15-year period during which the tree rings grew wider?

A) the climate was warmer and wetter
B)the climate was warmer and drier
C)the climate was colder and drier
D)the climate was colder and wetter

C. The climate was colder and wetter

Explanation:

This is because the dry sites have low moisture and high temperature. The food competition within the tree is likely greater and the base of the stem is likely to receive a limited food supply and this could cause it to produce narrow rings

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: