1)ecology is the study of interactions among organisms and their environment, such as the interactions organisms have with each other and with their abiotic environment.
2)ecosystem is the community of living organisms with interaction with their non living environment or components.
3)producers are organisms which prepare their own food without the dependence of other organisms.they extract their raw materials from nature without disturbing the natural cycle.they are the first level of food chain.green plants
4)herbivore ,omnivore and carnivore are all consumers.herbivores consume only plants ex-deer,cow.carnivore intake only the flesh of other beings ex-lion ,tiger.omnivores consume both plants and flesh of other animals ex-humans.
5)abiotic factors- they are the non-living chemical and physical components of the environment.
biotic factors-they are the living components of the environment.
6)Biodiversity, short for biological diversity, is the term used to describe the variety of life found on Earth and all of the natural processes. This includes ecosystem, genetic and cultural diversity, and the connections between these and all species.
7)The ecological niche describes how an organism or population responds to the distribution of resources and competitors (for example, by growing when resources are abundant, and when predators,parasites and pathogens are scarce) and how it in turn alters those same factors (for example, limiting access to resources by other organisms, acting as a food source for predators and a consumer of prey).
8)A food chain is a linear sequence of links in a foodweb starting from species that are called producers in the web and ends at species that are called decomposers in the web.
a food web is interconnected food chains,.\
9)Decomposers or saprotrophs are organisms that break down dead or decaying organisms, and in doing so carry out the natural process of decomposition.