The article states:
Mantis shrimp have super-powered eyes. They can see light and colors that other creatures can't. This allows them to share secret signals. They may flash invitations to possible mates. Or they may flash stern warnings to competing mantis shrimp that try to get in their way.
The author's purpose for writing this passage was to __________.
argue that mantis shrimp are smart because they can compete
explain why mantis shrimp can't see things other creatures can
argue that mantis shrimp are not safe from competing shrimp
show how mantis shrimp can "talk" to each other secretly