What are Difference between submarine and fish?

Submarines and fish differ primarily in their structure and function. Submarines are human-made vessels designed for underwater navigation, equipped with technology for propulsion, navigation, and communication, while fish are living organisms that breathe through gills and navigate using fins. Additionally, submarines can be controlled by humans or automated systems, whereas fish operate instinctively and rely on biological processes for movement and survival. Furthermore, submarines can be equipped with various tools for research or military purposes, while fish play crucial roles in their ecosystems.