<span>Physical weathering is a term used in science that refers to the geological process of rocks breaking apart without changing their chemical composition. Over time, movements of the Earth and environment can break apart rock formations, causing physical weathering.</span>
        
             
        
        
        
The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
        
             
        
        
        
Answer:
The answer to your question is:
Explanation:
1 or more double bonds                                    unsaturated
Usually solid at room temperature                    saturated
Molecules are tightly packed togheter             saturated
Usually liquid at room temperature                  unsaturated
Most plant fats                                                    unsaturated
Most animal fats                                                 saturated