Question

Why do functional texts have similar structural features?

because they replace the need for the audience to read, allowing them to make do with skimming or scanning
because they follow a specific tradition
because they are intended to explain a process
because they assist the reader in getting through the text quickly and efficiently

Answer 1

because they follow a specific tradition

Answer 2

I am pretty sure your answer is going to be " because they follow a specific tradition " I hope this helps!! :)