The term "symbiotic" refers to a relationship between two organisms where they benefit from each other, often seen in plants that draw sustenance or resources from one another. Here is the explanation for each option:
- Parasitic: Refers to a relationship where one organism benefits at the expense of the other, not the same as "symbiotic."
- Symbiotic: Refers to a mutually beneficial relationship, which is what plants that draw sustenance from one another do.
- Co-biotic: Not a standard term, incorrect in this context.
- Subsistant: Refers to something that sustains or supports life, not specific to relationships between plants.
Therefore, the correct answer is "symbiotic".