Answer :
Due to the fact that evolution is not goal-oriented, complex multicellularity has developed, and each group is successful with its current morphology.
From fungus to people, every multicellular organism first evolved from a single cell. Before assembling to create multicellular groups, these cells were able to exist on their own for billions of years.
The majority of archaeplastids are single-celled algae. The name “archaeplastid” refers to early plastids. Given that they may have ingested cyanobacteria and acquired chloroplasts through endosymbiosis, this is supported by evolutionary evidence.
In the course of evolution, other eukaryotes may have swallowed up archaeplastids to acquire chloroplasts. Some of the members of this group later developed multicellularity. Therefore, it’s merely a random event that could proceed in any way. The only difference is that Archaeplastida evolved in accordance with their environment and demands.
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