Step 1: Understanding the Question:
We need to identify the term for a specific biological interaction between two species where the outcome is negative for one and neutral for the other.
Step 2: Detailed Explanation:
Ecological interactions are classified by their effects:
1. Mutualism: Both species benefit (\(+/+\)).
2. Commensalism: One benefits, one is unaffected (\(+/0\)).
3. Parasitism: One benefits, one is harmed (\(+/-\)).
4. Amensalism: One is harmed, while the other remains unaffected (\(-/0\)).
An example of amensalism is the mold Penicillium secreting penicillin which kills bacteria; the bacteria are harmed, but the mold does not gain any direct nutritional benefit from their death.
Step 3: Final Answer:
Amensalism is the interaction where one species is harmed and the other is unaffected.