The Cambrian Explosion is when diverse animals were first recorded as fossils. 
        
             
        
        
        
Answer:
D: It is based on facts.
Explanation: 
The reason is because science is based off of data and analsys which 
 
        
             
        
        
        
Answer:
Mass units are equal to Kg
Explanation:
As per the requirement of the question, the data provided to compute the mass units is
Density = 100 Kg/L
Mass = 1000 units
According to the given situation, the mass units is presented below:-
As we know that the
Mass units are equal to Kg
Therefore, for determining the mass units we simply equal the Kg.