What Is Biodiversity?

This is an excellent question!  Biodiversity relates to the diversity of organisms within an ecosystem.  It is a measure of how many different kinds organisms can be found in a given ecosystem.

For example: An intertidal zone can have tremendous biodiversity, for in it can be found several different seaweeds and kelps, plankton, grasses, snails, crustaceans, barnacles, bivalves (clams, mussels, quohogs), several kinds of shorebirds that feed on these animals, etc.  So you see, you have several species from plants and algaes, all the way up to predatory birds.

The number and variety of organisms found within a specified geographic region. The variability among living organisms on the earth, including the variability within and between species and within and between ecosystems

Biodiversity is the variety exist in the plants and animals in a country/area etc.

The diversity in species, genes and ecosystems in a specific region. This region can differ from something very small like your room or neighborhood to the entire earth. Biodiversity is often a measurement for the health of the region. Usually it's the more diverse the life is in the region the healthier.