Any individual stage of ecosystem growth is referred to as a Seral stage. Thus, the correct option is D.
What is an Ecosystem?
An ecosystem may be defined as a place or an area where individuals of multiple species live together and interact with one another for the purpose of food, shelter, and space.
The Seral stage is developed after the pioneer stage in ecological succession. Due to frequent disturbances in the ecosystem, individual species evolved and make their own updated versions.
Therefore, the correct option for this question is D.
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