2. A valley glacier advances down a mountain valley and then retreats. How did the
glacier most likely change the valley?
DA by filling in the stream bed with sediment
O
B
by carving a V-shape into a U-shape
C by carving a U-shape into a V-shape
O
D
by filling in hanging valleys

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:

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

its temperature is increasing. this causes molecular vibrations to increase.