The answer is going to be B
Letter b. Divergent boundary
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Cladograms have a cladistic characteristic and a phylogenetic tree where it examines and illustrates the evolutionary relationships of organisms. Evolutionary relationships are determined through various models such as DNA, morphology, embryology and others.
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The smallest living unit is actually a cell. An organelle is an organ inside of a cell. An organelle would not be considered alive because it can not survive without the other organelles. Whereas, a cell can survive without other cells.