Answer to Question 1
An extended definition is a longer and more detailed explanation of a
word or term. The writer might use any of the other modes of development
in an extended definition.
Answer to Question 2
A formal definition explains the meaning of a word or term by assigning it
to the class of items to which it belongs and then explaining how the word
or term differs from other items of that class. A formal definition relates to
classification by assigning the word or term to the class of items to which
it belongs.
Protostomic versus Deuterostomic development
Development of the Internal Sex Organs
Prenatal Brain Development
Phases of Drug Development
Lifespan Development, 7th Edition
Development of the Endocrine System