What characteristics of organisms older than 540 million years ago makes fossils?

I'm not exactly sure what makes fossils but they used to not have hard bodied organisms they were soft.

This  focuses on  the entrepreneurial leadership of these  growth  firms.   governmentministers can play a critical  role  in  fostering  enterprise and innovation. their  role  is to direct thegovernment  departments and agencies to  focus  on the problem and develop effective policies.