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Definition of population: All the living organisms of same species living in a particular locality constitute the population. Population include various types of organisms which belongs to same species. We can found number of populations on planet Earth. Like human population, ant population, cats population, and many more.

Ecosystem: Two or more biotic communities which interact with the physical or non-living environment together constitute as Ecosystem. Examples: A forest, a mountain, a garden, a pond etc,.. Biome: Group of ecosystem constitute as Biome. A group of ecosystem taken togther in an area hving the same type of climtic conditions is consider as Biome. Biomes can also be consider as major or big sized ecosystem.  Examples: Temperate forests, deserts, evergreen forests, sea, big lakes etc,.. where many ecosystems are found within a biome.

Community: Definition: The population of different species found in aparticular place constitute the community. Example: In a garden, we can find different species which are living in a same environment such as insects, rodents, lizards, birds, ants, honey bees and many more species can be seen. Biotic community: Definition: Population of all the different species which are found in the garden constitute a Biotic Community. Biotic refers to the organisms which is different from human communities.

Vacuole: Vacuoles are the clear cavities in the cytoplasm.   These are filled with water and various substances in solution. Animal call contains small and less number of vacuoles. Plant cells contains large vacuole Sap: In plant cells vacuoles are large and contains a liquid called cell sap or sap.