Crocodiles open their mouths ... 1) to get colder 2) to swim faster 3) to scare people

Crocodiles open their mouths 1) to get colder, according to the text: "On hot days, crocodiles keep their mouths open. This is how they get cool!"

Ответ: to get colder

Ты отлично справился с заданием! Так держать!