Question
a.
Relational databases are more useful in the development of biological databases
b.
The tables in relational database are carefully indexed and cross-referenced with each other, sometimes using additional tables, so that each item in the database has a unique set of identifying features
c.
The relational database orders data in tables made up of rows giving specific items in the database, and columns giving the features as attributes of those items
d.
The two principal types of DBs are the relational and object-oriented databases
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