According to the rivet-popper hypothesis (by Paul Ehrlich), the loss of species in an ecosystem is analogous to:
Correct: A
The rivet-popper hypothesis, proposed by Paul Ehrlich, compares biodiversity loss to the removal of rivets from an airplane. Just as an airplane can lose a few rivets without failing but will eventually crash if too many are removed, an ecosystem can tolerate some species loss but will eventually collapse when the loss exceeds a critical threshold. This metaphor emphasizes that species are not redundant and that each species plays a role in maintaining ecosystem integrity, function, and resilience. It underscores the importance of conserving biodiversity to prevent ecosystem collapse.