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Homosapiens lived about 10000 to 12000 yrs ago, which lived before the homosapien sapiens (humans).
a special feature of echinodermata is that it has a water vascular system.for example: star fish, obelia etc
bio diversity refers to the diverse species and the plant bodies occupying a ecosystem.

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Homosapiens refers to Human Beings (including us).
Echinodermata is a phylum name. It constitutes of marine invertebrates. Example: Sea cucumbers.
Biodiversity constitutes the Ecosystem which refers to the inter-related relationship among the biotic and abiotic components of the environment.