Question

symbiotic interactions
which symbiotic interaction involves two organisms
competing for the same resource, resulting in a negative
outcome for both of the species involved in the interaction?
competition
predation
parasitism
mutualism

Explanation:

• Competition: As described, it involves two organisms vying for the same resource, and it's negative for both species. For example, two plant species competing for sunlight in a dense forest - both may have stunted growth due to limited light availability.
• Predation: One organism (predator) benefits (+), and the other (prey) is harmed (-). For instance, a lion (predator) eating a zebra (prey).
• Parasitism: One organism (parasite) benefits at the expense of the other (host), usually harming the host over time but not immediately killing it like in predation. An example is a tick (parasite) feeding on a dog (host).
• Mutualism: Both organisms benefit (+, +). Bees (get nectar) and flowers (get pollinated) are a classic example.

Since the question asks for the interaction where two organisms compete for the same resource with a negative outcome for both, competition fits.

Answer:

competition