Common descent from a first ceII evolution is the belief that populations of living things that never had brains 'evolved' brains into existence over generations before such things ever existed at all. Same for ears, eyes, lungs, hearts, digestive systems, reproductive systems, and so much more.
But they can't cite evolution evolving such things into existence over generations, proving this is contrary to all of biology/science. They write papers about why they insist we believe it's true anyway, and that we should hence discard all of biology on the matter.
Be not deceived.
And for Christians who question such things:
Jesus said Adam and Eve were made at the beginning of creation, not 14 billion years later at the end of creation.
And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female,
Matthew 19:4
God also made it clear suffering, disease and death did not enter into creation until after mankind sinned, not for billions of years before mankind ever sinned through no fault of mankind.
Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
Romans 5:12
And in case Christians are deceived with "well, science says...": consider: It's observable, repeatable, verifiable that when a person dies, body growing room temperature, such a person is not coming back. So do you reject the resurrection "because science" when that actually IS science?
Of course not.
So don't be so quick to dismiss other parts of God's Word over belief systems ignorantly or dishonestly passed off as science when it's contrary to all of biology/science.
"Yeah, hath God said...?" is how the devil got Adam and Eve to sin: doubting His Word.
Black Attacks White Kid in Bathroom!
It Doesn’t Go the Way He Thought...
Instead he met White Rage.
And he couldn’t cope.
This is what happens when our kids finally fight back.