(20 points!)

Answer both correctly for best answer



When might preserved remains of an entire organism form?

1. when sediment buries the hard part of an organism
   
2. when an event such as a quick burial or freezing preserves an entire organism
   
3. when minerals replace parts of an organism
   
4. when a thin layer of carbon is left on a rock
   
   
   
   

Which of the following fossil types is best described as forming when minerals replace all or part of an organism's body?

1. a mold
   
2. a petrified fossil
   
3. a cast
   
4. a trace fossil