Define the following terms : Parasitism
Parasitism is a relationship between two species where one, the parasitic species, benefits at the expense of the other, known as the host, by causing harm.
Organisms and Populations
Natural world around us shows amazing diversity of forms and complexity of relations. To understand these, we have to study levels of organization in the living world viz. macromolecules, cells, tissues, organs, individual organism, population, communities, ecosystems and biomes.
Define the following terms : Commensalism
Commensalism is a symbiotic relationship where one species benefits while the other remains unaffected, experiencing neither harm nor benefit.