किस प्रकार की पारिस्थितिक जैविक बातचीत (Biotic Interaction) एक ऐसे संबंध की विशेषता है जहाँ दोनों प्रजातियों को नुकसान (-/-) उठाना पड़ता है?

Which of the following biotic interactions is characterized by one species being harmed while the other species remains unaffected, as demonstrated by a walnut tree secreting juglone to inhibit the growth of nearby plants?

In the context of biotic interactions within an ecosystem, what is the specific nature of the mutualistic relationship between mycorrhizal fungi and plant roots?