Answer:
The Paramecium reproduce asexually. You can tell because there is only one needed to reproduce.
 
        
             
        
        
        
The two are potassium and rubidium. Why? Na is an alkali metal. As you go down the metals become more reactive. 
Calcium has 20 protons. Why? The atomic # is 20 (the one at the top). 
It has 20 neutrons. Why? The atomic mass (the number on the bottom) is ~40, ignoring electron mass. 40- 20 protons = 20 neutrons. 
It has 20 electrons. 
Why? The # of protons and electrons is the same. Ions aren't on the periodic table.
Please mark brainliest if I helped you!
        
                    
             
        
        
        
<span>The Cerebrum: The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. The cerebral cortex is divided into four sections, called "lobes": the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.</span>
        
                    
             
        
        
        
Answer:
Is an animal that can be dependent or able to get internal generation from heat. So basically a warm blooded animal.
 
        
                    
             
        
        
        
C. Protective over young cubs