Answer:
DNA 
It transmits genetic information to the next generation
Explanation:
 
        
             
        
        
        
<h2>Sodium channels </h2>
Explanation:
Depolarization is a result of sodium channels opening as a result of chemical or pressure-based stimuli     
- Depolarization starts when a threshold stimulus applied on a neuron via Na+ mechanically operated channels that trigger action potential 
- Action potential is an efficient signaling process by which distantly located cells communicate to each other 
- Depolarization of membrane potential is due to influx of Na+ via voltage gated Na+ channels 
- Fast opening of voltage gated Na+ channel shifts membrane potential from -70mV to + 50mV at which voltage gated Na+ channels become inactive thus influx of Na+ abruptly stops         
 
        
        
        
Answer:
A
Explanation:
1. The colour is non metallic. 
2. properties of metal solidness is not there, because of results of hammer experiment. 
3. Physical consistency is not solid. 
Etc. 
 
        
             
        
        
        
B double helix and linked with hydrogen bonds