Euglena as unicellular dual organism

As Euglena has both plant and animal like characteristics it can be called as a dual organism. Explanation: ... The Euglena can perform photosynthesis like plants but can feed on other microscopic organisms like heterotrophs or animals.

Explanation:

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:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.