In amensalism:

One species is harmed whereas the other is unaffected

The correct answer is Option (3) → One species is harmed whereas the other is unaffected

In amensalism, one species is harmed whereas the other is unaffected.

Explanation:

• Amensalism is an ecological interaction in which:
• One species is inhibited or harmed and other species is neither helped nor harmed

Example:

• Penicillium fungus secretes penicillin → inhibits nearby bacteria.
• Bacteria = harmed
• Penicillium = unaffected