The difference between an R-selected species and a K-selected species is that the R-selected species live in variable, unstable habitats, while K-selected species reside in stable environments. R-selected species produce... More » Science Biology

Mollusks reside in many habitats around the world: most live in marine environments such as oceans and bays, while others reside in freshwater areas and even on land. Mollusks inhabit virtually every type of ecosystem on... More » Science Biology Zoology

A generalist species is one that can live in a wide variety of habitats and have a varied diet, while specialist species are adapted to a particular environment or a specific diet. Koalas and tiger salamanders are exampl... More » Science Biology
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Distinguishing features of organisms in the Phylum Echinodermata include a lack of body segmentation, radial symmetry and life adaptations for marine environments. The Phylum Echinodermata includes more than 6,000 differ... More » Science Biology