Explain why these two plants look so similar if their common ancestor was very distant

The two diverse cactus species see comparative since they live within the same environment. They have advanced comparative structures, closely resembling structures, to adjust to this environment.

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Explanation:

this is the picture

The two different cactus species look similar because they live in the same environment.  

They have evolved similar structures, analogous structures, to adapt to this environment.

Explanation:

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint