The statements below are followed by two conclusions labeled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements.

Statement 1 : All shells are skins.
Statement 2 : No skins are cats.

Conclusion I : No shells are cats.
Conclusion II : Some skins are shells.