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.
Phytochrome controls germination by responding to red/far red light signals.
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
a Hyenas and other scavengers may have competed with early hominins for access to carcasses.
Apply deep effleurage to triceps. Position arm with elbow pointing upward to access the triceps ...
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Pathway by which the nervous system controls skeletal muscle contraction