Help answer the question about greek architecture

Help me with my year 8 assignment on roman and greek architecture, PLEASE?
Please help me with these questions about greek and roman architecture.
Its for an art assignment which is due tomorrow and i have alot to do

Why was the Greek post and lintel system not satisfactory for Roman buildings?

How did the architects of the Parthenon take into account the optical illusion that occurs to straight lines from a distance?

What new material did the romans use?

What structural systems did the romans invent?

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