This sentence is incorrect because it is a run-on sentence. This means that it should be broken into two separate sentences: 
Ladybugs are also called lady beetles. In Europe, they are called ladybird beetles. 
It's easy to catch this mistake by either reading the sentence out loud and listening for a natural pause, or by looking for one subject and one verb per sentence (Ladybugs are; they are).
        
             
        
        
        
<span>The father must choose between the deaths of his children or the deaths of them all. This best portrays the moral dilemma in this Grimm fairy tale.</span>
        
                    
             
        
        
        
Answer/Explanation:
If you were to leave out a step or go in the wrong order, it might be confusing for readers. So it is important for you you to go in the correct order for it to be a good piece of writing.