In order for an organism to develop specialized tissues, the organism must be a multicellular organism​. Therefore, D is the correct option.
What are multicellular beings?
Multicellular organisms are organisms that have multiple cells, in contrast to those organisms that organism which is single cellular. Multicellular organisms can perform many functions since they have different cells to perform different functions.
Different cells carry different functions in the body of multicellular organisms. While a few cells are dependent upon their cells in order to carry on their work, other cells are independent in order to carry on their life functions.
An organism must be a multicellular organism in order to create specialized tissues. D is therefore the best choice.
To know more about multicellular organisms, visit the link below:
https://brainly.com/question/24381583
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