They are important because so people do not get sickness
 
        
                    
             
        
        
        
Going down A-D
Going across is 1-4
A 4
B 3
C 1
D 2
Hope this helps! Brainliest?
Have a great day :)
        
             
        
        
        
Answer:
because people where not alive yet oontill cenoznic era
Explanation:
 
        
                    
             
        
        
        
You have give the question because we need to look the f1 generation traits first
        
             
        
        
        
<span>all
a. Reduce sun exposure.
b. Reduce alcohol consumption.
c. Avoid tobacco.
d. Utilize early screening.</span>