Please answer the following question: You are presented with the question "What could not produce enough offspring?" and the following answer choices: - Deoxyribonucleicacid - killer whales - Echinoids - single-celled organisms - sparrows - great white sharks - passenger pigeons - one celled organisms Now knowing that if all members of a species cannot produce offspring then that species will likely become extinct and passenger pigeons are extinct, choose the best answer.
A:
passenger pigeons