Debunking Those who Don't Believe The Noah's Ark Event

Their Position:
https://www.facebook.com/100007496734119/videos/1075564360443174/

Does the sacred writ say that species brought in the Ark were full grown? No.
Then why the assumption? The assumption is needed to support their unbalanced conclusions.

Special Note: Scientist more often to not present estimations. Best guess scenario's especially when it comes to pre flood.