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I need articles with information such as phylum, genus, species, scientific name, niche, fun facts, etc. By the way what is phylum, and genus. What is my science article paper looking for when it asks me for phylum and genus?

I was awarded the four year scholarship, and will be attending Milwaukee School Of Engineering crosstown affiliate of Marquette. My major will be Mechanical Engineering. When will be the last opportunity for me to go Marine Option. Honestly I’m considering marine option because while all members of the military are cherished, Marines in my hometown are treated with a completely different honor. The most important thing after serving my country, is having a career in the private sector. I don’t plan to be a career officer, I want to start civilian life maybe ten to twelve years after commissioning in my early 30’s, so i can start my family. Should I stay as a midshipmen and hopefully go off to Nuclear Power School, or choose Marine Option and pursue combat engineer.

HELP WITH MARINE SCIENCE HOMEWORK?
1. explain why extremely unstable environments tend to have relatively low biodiversity,give examples including coral reefs(stable and not extreme),sand on a reef slope(unstable)and hydrothermal vents(extreme)
2. Give examples of organisms that occupy specialized and general ecological niches,including coral-eating butterfly fish and tuna
3.Explain why habitats with high biodiversity tend to contain narrow ecological niches