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Probably the green algae, which descended from cyanobacteria. Seaweeds come in three colours, green, brown and red, and each has different photosynthetic mechanisms - not only chlorophyll.

The intertidal zone may have played an important part in the colonization of the land from aquatic plants.

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13y ago
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5mo ago

The oldest ancestors of plants are believed to be green algae, which are aquatic organisms that share similarities with land plants. Green algae are considered the evolutionary precursors to the first land plants, which eventually evolved to become the diverse plant species we see today.

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9y ago

I believe its Green Algae but you'll have to check on that I'm sorry I .

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13y ago

Charales is the name of the order of green algae that is believed to have preceded land-based plants. It is a freshwater organism.

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12y ago

The photosynthetic protists. Such as Rhodophyta and Chlorophyta.

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12y ago

green algae.

Charophytes

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11y ago

Plants and Fungi

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11y ago

Filamentous branched algae

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12y ago

green algae

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13y ago

Lichen

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Q: What are the oldest ancestors of plants?
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other plants


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Plants are the ancestors of seaweeds. Convergent evolution caused their similarity. Both evolved from brown algae. Seaweeds are the ancestors of plants. Seaweeds are aquatic plants.


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