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Ecology, Food Chains, Biodiversity

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Organisms in their Environment
The meaning of some common words used to describe organisms in their environment are:
ecology - the study of living things in their environment.
environment - all the conditions that surround a living organism.
habitat - the place where an organism lives.
population - all the members of a single species that live in a habitat.
community - all the populations of different organisms that live together in a habitat.
ecosystem - a community and its habitat.

Key words in Ecology: Abiotic factors, biotic factors, niche, habitat, population, community, ecosystem, biome, biosphere, decomposers, autotrophs, heterotrophs, symbiosis, mutualism, parasitism, commensalism, and competition.

Food Chains
Food chains help us understand the connection between living things.
What eats what? Where does the energy that life needs to survive come from?
Learn about producers, primary consumers, secondary or tertiary consumers, apex predators, and decomposers and the roles they play in food chains.
What is Biodiversity?
Biodiversity is the term used to describe the number and variety of species in an ecosystem. Most ecosystems have a high biodiversity, which means they have a large number of different species showing a great variety of features. If the balance between some species in the ecosystem or between the abiotic factors and the community is destroyed, the biodiversity may fall as some plants and animals die out.

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