This question is really confusing. Judging from the pictures, the four pictures are in different environments. Sea lions are on land, dolphins jump out of the water, penguins are on ice, and sea fish are in the depths of the ocean. Judging from the text in the title, it is Doudou who goes to the aquarium to see animals. It must be the process from land to sea. The first thing they saw was sea lions on land, followed by penguins on ice, dolphins on the water, and marine fish in deep water. I wonder if this analysis is correct?