- - Explanation for an evolutionary transition
- - Mystery to evolutionists
- - Elusive evolutionary claim
- - Evolutionary mystery
- - Elusive evolutionary connection
- - Long-sought evolutionary connection
- - Elusive evolutionary connection, or the elusive feature of the ends of 18-Across and 3- and 28-Down
- - Evolutionary chain mystery
- - Theoretical connection ... and a hint to interpreting several Down answers in this puzzle
- - 2019 animated film written and directed by Chris Butler
- - *Hypothetical human ancestor
- - Hypothetical human ancestor, or what connects the two words of each starred answer
- - Literal and figurative hint to four puzzle answers
- - Thing needed to complete a series
- - I'm kissing fifty Northern characters to find my absent ancestor
- - URL that doesn't successfully lead to a website?
- - Ape man, maybe
- - Gap in a series
- - Bobo
- - Art letter
- - Anthropologist's topic.
- - Hypothetical being.
- - Anthropologist's concern
- - XXX
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