Please forgive my ignorance, but I am stumped.
1) How do we evolve if a negative trait does not kill us before we reproduce? For example if I have some genes that are maladapted to refined carbs but have already popped out a kid before it has killed me how is natural selection taking place even over say 20 generations? I mean how often do people really die of refined carb related illness before they can squeeze out a kid?
2) If we have been around for 2.5 million and grains have been around for 10k how much adaptation has taken place?
3) I guess I am asking is natural selection the only way we evolve or are there smaller feedback loops on like a cellular level. I just donít get it.