<span>There are three different subatomic particles present in the atoms of each element: neutron, proton and </span>electron<span>. It is the </span>electrons<span>, and more specifically the valence </span>electrons<span>, that determine the reactivity of an element.</span>
        
                    
             
        
        
        
The awnser is D or the 4th one
        
                    
             
        
        
        
Answer: high iridium levels in a 66- million-year-old clay layer in Denmark and Italy 
Explanation: 
 
        
                    
             
        
        
        
Answer:
The Art of Protein Synthesis
In eukaryotic cells, transcription takes place in the nucleus. During transcription, DNA is used as a template to make a molecule of messenger RNA (mRNA). The molecule of mRNA then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs.
Explanation:
Plz mark brainliest thanks
 
        
             
        
        
        
False
nuclear fusion produces more energy than a nuclear fission reaction.