Chordates<span> are eucoelomate deuterostomes, and probably share a common ancestor with </span>echinoderms<span>. Three important characteristics unite the Phylum </span>Chordata<span>. At some point in their life cycle, all </span>chordates<span> have a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits.</span>
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Assessment of species richness is the community approach study of ecology.
Community approach study of ecology is essentially assessing the composition of a community, including the number of species in that community and their relative numbers.
Community approach helps to study the interaction between structure and organisms.
Structure describes characteristics of ecological niches, species richness and species composition.
Species interact with each other and with their environment in many different ways, such as competing for finite resources or working together to trap game
There are two commonly used to describe the composition of a community are species richness and species diversity.
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1. mica 2. structure 3. ehorizon 4.