most of a atoms mass is in the nucleus of the atom:) hope this helps you
 
        
                    
             
        
        
        
Quick Answer. Collagen is the protein that all animals have in common, even single-celled animals and creatures such as sponges that lack differentiated bodies. Collagen is a cable-like protein that can calcify into bone, shell or other hard structures.
HOPE THIS HELPS AND GOOD LUCK
MARK BRAINLIEST PLZ!!!!!!!!
 
        
                    
             
        
        
        
Answer:
2nd one is the most realistic of what occurs in ecosyystems
 
        
                    
             
        
        
        
Potassium has the greatest influence on the resting membrane potential. Resting membrane potential is caused by the differences in the concentrations of ions inside and outside the cell. At resting membrane potential there are more sodium ions outside the neuron and more potassium ions inside the neuron. For a neuron the resting membrane potential is about -70 mV.