What innovation of data structuring was introduced in ALGOL 68 but is often credited to Pascal?

What innovation of data structuring was introduced in ALGOL 68 but is
often credited to Pascal?

What design criterion was used extensively in ALGOL 68?

What language introduced the case statement?

What operators in C were modeled on similar operators in ALGOL 68?

. What are two characteristics of C that make it less safe than Pascal?