Historical clue formulations

• Reproductive cell — 2024-08-22
• Egg, e.g. — 2021-08-08
• Product of meiosis — 2019-09-07
• "___ over" (dispiriting message) — 2016-07-24
• Egg, for one — 2016-05-22
• Life starter — 2014-10-23
• It passes through a pollen tube — 2009-08-22
• Reproductive cell — 2001-12-26
• Reproductive cell — 1999-11-10
• Egg, for one — 1999-10-26
• Reproductive cell — 1997-11-08
• Reproductive cell — 1996-11-24
• Reproductive cell — 1994-09-12