It’s intended to be humorous. Like the joke about "All I want is a simple thanks when I bring you breakfast in bed – not that ‘who are you! what are you doing in my house!’ stuff.
Correct. The egg would have been laid as the first modern chicken by a chicken-but-not-quite-modern-form. Humans would have taken over the natural selection process from there.
It’s intended to be humorous. Like the joke about "All I want is a simple thanks when I bring you breakfast in bed – not that ‘who are you! what are you doing in my house!’ stuff.