decent, descent

Decent or decent ( DEE sent ) means proper or seemly--
We'll have to pay for the damage. It's the only decent thing to do.
Pick up that trash. Decent people don't litter!
Don't look. I'm not decent.

Descent or descent ( dee SENT ) means the state or condition of going down--
His ears hurt when the plane made a steep descent.
Their descent from the tower was made in a helicopter.
Descent is also used to mean the lineage of a person--
They could trace their descent from the first settlers on Plymouth Rock.
The Bible traces the descent of Jesus from Adam.

Now that you know that, you can say--
"The notion that the descent of man can be traced back to the primordial ooze is just not decent to some  people."

Note--"descend" is the verb ( action word ) form of "descent"--
They spent hours waiting for the balloon to descend.

Note # 2--"de-scent" means what you might have a veterinarian do to a pet skunk--remove its scent glands, or "de-scent" it--
Mom said if the veterinarian will de-scent the skunk, we can keep it.

Note # 3--"dissent" means political disagreement with the majority or with accepted ideas--
People were once jailed for dissent. Now we are guaranteed freedom of speech.