Answer to Question 1
FALSE
Answer to Question 2
An abstract class is one that cannot have instances, while a concrete class can. If a class has all the required attributes and operations that we expect from an object, then it is concrete. If it has only a subset, then it is abstract and we need a more specialized class. For example Art is an abstract class because we have found it to be too general to satisfactorily represent a specific work of art. Saying that somebody is interested in art does not explain enough. At best, it prompts a question: what kind of art? The answer might be music, literature, painting, theatre, etc. On the other hand, the Literature class has enough attributes to be concrete. That is, we believe it can properly represent an actual literary work.
Injecting an IV push (bolus) medication; C, another type of needleless syringe and needleless IV acc
a Hyenas and other scavengers may have competed with early hominins for access to carcasses.
Cascade of regulated splicing that controls sex determination in Drosophila embr
Needle-nose pliers are used where there is limited access to a wire or pin that needs to be ...
Removing the bed from a pickup truck makes gaining access to the fuel pump a lot easier.
Turn head for access to posterior cervical muscles. Locate TrPs along posterior cervical muscles, ...