Help please! I would give brainliest and 50 points! It is a select all, if one answer then no brainliest! Here ya go.

Select all that apply.

Which of the following is true of all four civilizations—India, China, Egypt, and Sumer?

They were located between two rivers.

They established trade routes.

They developed irrigation systems.

They believed in many gods.

They developed in river valleys.

They invented plumbing systems.