Parasitism - The relationship that one organsim benefits while another organism harmed (ex, hookworm and human), Mutualism - Relationship between two organisms of different species in which both get benefits (ex, lichens; fungus and alga)), Competition - Relationship between two organisms where neither of the organisms benefits (ex, lion and tiger competing for food in the same place), Commensalism - Only one gets benefits (ex, large herbivores and egrets), Predation - Predator-prey relationship (ex. lion and deer), Decomposer - organism that break down dead plants and animals, Ammensalism - Relationship between two organisms of different species where one species causes harm to the other without any benefits, Neutralism - Relationship between two organisms of different species where neither of the organisms benefits or harmed, Deserts - Found in areas where the rainfall is very low. They may be hot and cold. They are mostly rocky and sand covering large areas., Tundras - Terrestrial ecosytem that can be found in the Arctic and Antarctica. They have high mountains and cold., Chromosomes - are thread-like structure that form the nuclear material of the cell and contain information that organism needs, Biodiversity - the number of plants, animals, and other living things found in particular habitat, Forests - receive heavy rainfall, large number of organisms are found in this ecosystem, Huntington's disease - A fatal disease that causes the degradation of nerve cells in brain, gene - part of chromosome that has the code for a specific function or characteristic, genotype - all the genes that an organism has, phenotype - the observable characteristics of an organism, recessive - expressed only if two copies of the alleles are present, Dominant - expressed even if only one copy of the allele is present,

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