Cacti in the Deserts of Southwestern North America and Some

question 27

Multiple Choice

Cacti in the deserts of southwestern North America and some euphorbs in the deserts of Africa have barrel-shaped stems,short-lived leaves,and spines,yet these two types of plants are from different evolutionary lineages.The similar morphology of the two groups of plants is an example of:

• A)a developmental homology.
• B)directional selection.
• C)an anatomical homology.
• D)convergent evolution.
• E)stabilizing selection.

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