Answer:
that would be C, seafloor spreading occurs!
Explanation:
 
        
             
        
        
        
A dominant trait can be shown both when an organism is homozygous dominant AND heterozygous. Two different genotypes give the same visible result so a testcross is needed to be able to accurately say if the organism is homozygous dominant or heterozygous
        
             
        
        
        
Answer: Option D 
Explanation:
The bacteria can undergo cell differentiation in response to the environmental conditions.
The oxidative stress, antibiotic exposure, stress conditions are some of the external conditions due to which the bacterial cell can respond in the cell differentiation.
The bacterial species can divide based in the conditions in which they are put. So it is true that under stress conditions the bacterial cell can undergo cell differentiation.
 
        
             
        
        
        
A- tectonic plate motion caused the Atlantic Ocean basin to increase in size