Characteristics of fish and amphibians quiz online, 4th, 5th, 6th Grades. In this quiz students will learn about fish and their different parts as well as their related functions. Learn about the fins, lateral line, fish eye and more. Learn about floating mechanims of fish and why sharks do sink to the bottom of water when not swimming. Also learn about other reptiles and their characteristics, learn about their cold blooded nature, reproduction etc. This biology quiz can be used by parents and teachers to review ahead of exams. Have fun learning online and please share.