Some scientists have studied several existing nautilus fossils and found that the wavy threads on their shells have the same function as tree rings. The threads are divided into many spaces. Although the width and width are different, there are about 30 small wavy growth lines. The number of days per month in the modern lunar calendar is exactly the same. Observations have shown that the wavy growth line of the nautilus grows one every day and every other month. And there is a lot of scientific evidence that the moon is gradually moving away from the earth, and the lunar calendar is exactly the moon around the earth Days of the week. It can be inferred from this:. ['The wavy growth line of nautilus will grow longer and slower.', 'The wavy growth line of nautilus will grow longer and wider.', 'The spiral shell growth line of the same geological age is fixed.', 'The number of growth lines per ancient nautilus gradually decreases as the fossil age advances.']