The underlined subject of this sentence

read the sentence.
the skyscraper that was built
last year has the most
extraordinary architecture.

1. an adverbial phrase.
2. a noun phrase.
3. a prepositional phrase.
4. a verb phrase.

a verb phrase.

or a prepositional phrase. (choose this)

there is a sequence and logical steps to give an answer of a trouble.

1) strategy is necessary to develop an project idea.

2) to study and know the environment where you are going to work ( ecosystem).

3)   the materials resources to built the ideas.

4) to give a priority order in the context that you study. in this case human needs.

you shopuld find your answers here if you need more. the answer is the infinite variety of human nature