The deepest and largest ocean is:

🧠 Explanation:

The Pacific Ocean is the deepest and largest ocean, covering about 155.6 million square kilometers and reaching depths over 11,000 meters in the Mariana Trench. It influences global climate, trade, and marine biodiversity, hosting diverse ecosystems like coral reefs. Its vastness shapes international shipping and environmental policies. Studying the Pacific is key in oceanography, climate science, and geopolitics, highlighting its role in global ecosystems, economic routes, and environmental conservation efforts, making it a central topic in geographical and ecological studies.