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What is a food chain? Shows what eats what and in what order Producer makes own food Primary consumer eats producer Secondary consumer eats primary consumer What is an ecosystem? a place were living things interact and depend on what is the relationship between prey and predator? prey is the predators food What is a keystone species? species that other species depend on what will happen if a prey species predator is taken away? The preys population will grow because there is nothing to eat it How do you calculate the birth rate? (or death rate if you replace it with birth rate) population÷birth rate x 100 What is an adaptation When an animal has a physical feature that helps it survive in the climate What are limiting factors weather space and food how can limiting factors keep a population from increasing It keeps dying off less common How do humans compete with other species? Human want wild life or food Why should humans care about endangered species? could be a keystone and if one keystone dies then everything will be effected