Darwinian
They incorporated Darwinist concepts of heredity into their thinking.
There are fossils to support Darwinist theories.
Infidelity is more about emotional immaturity and an ego boost than some kind of Darwinist legacy.

SMART Vocabulary: related words and phrases

Making progress and advancing
adaptive evolution
advance the cause
advanced
advancement
age
boom
evolved
flourish
flower
formatively
from A to Bidiom
furtherance
journey
mature
rebuild
regenerate
ripen
ripeness
self-advancement
spread

You can also find related words, phrases, and synonyms in the topics:

Animal & plant biology - general words
Ideas, concepts and theories
Darwinist
noun[ C ]
uk /ˈdɑː.wɪn.ɪst/ us /ˈdɑːr.wɪn.ɪst/
someone who accepts the theories of Charles Darwin, which described how animals and plants change and develop over millions of years, with those that are best suited to their environment being the most successful and others that are less well suited not continuing to exist:
Darwinists believe that students should learn more about evolution.
It does not take a Darwinist to work out that any competition has losers.
Synonym