• Biodiversity has three levels: ecosystem diversity,species diversity and genetic diversity

Ecosystem diversity:

1. Various types of ecosystem create various habitats for organisms
2. Examples:

• Tropical forests
• Mangrove forests
• Rivers
• Marine

Species diversity:

1. Various organisms with different species that lives in a particular ecosystem
2. Examples:

• Seaweedes
• Corals
• Lobster
• Crabs 
• Sharks

Genetic diversity:

1. Various genetic combinations that existed in a species
2. Examples:

• Population of grouper fish with various genetic combination

Importance of ecosystem diversity:

• To have various habitats for organisms
• To balance biogeochemical cycles such as carbon cycle and water cycle
• To provide various food sources for humans and other organsims
• To provide sources of medicine,research and construction for humans
• Places for recreational activities
• To give aesthetic value to humans

Importance of species diversity:

• To provide various food sources for humans and other organisms
• To provide sources of medicine,research and construction for humans 
• To have an equilibrium interspecific interaction in an ecosystem

Importance of genetic diversity:

• To have a species which consists of different genetic combination
• To provide research source to humans
• To increase variations of a species
• To increase survival of a species