Answer:
It is positive. B/c nucleus consists of postively charged particles called Protons, and neutral charged (no charge) particles called neutrons. So it has a net positive charge. 
Explanation:
 
        
             
        
        
        
The five types of consumers are, omnivore, herbivore, carnivore, scavenger, and detrivore/decomposer.
        
                    
             
        
        
        
Natural selection! In the theory of natural selection, those with less beneficial traits won't live to reproduce, but those with beneficial traits will be able to reproduce and pass on those traits to their offspring, which significantly increases the frequency of those beneficial traits.
        
             
        
        
        
<span>It is a nerve agent. Or chemical asphyxiant. An example is Hydrogine Cyanide.  </span>
        
             
        
        
        
Answer:    Membrane transport proteins are specific and selective for the molecules they move, and they often use energy to catalyze passage. Also, these proteins transport some nutrients against the concentration gradient, which requires additional energy.
Explanation: