Science Study Materials

Resources Something in an ecosystem that is required by an organism Hypothesis A proposed explanation for an observation based on previous information that is used as a starting point for an experiment Controlled Experiment An experiment in which only one variable is changed at a time Independent Variable he variable that is changed in an experiment Dependent Variable he variable that is measured in the experiment Control Group The group in an experiment that the independent variable is not applied to Experimental Groups The group in an experiment that the independent variable is applied to Procedure The steps that are followed in an experiment Carrying Capacity The number of individuals of a particular type that an ecosystem can support Population Density he size of a population in a given area What are the 5 basic needs of plants? Water Sunlight Nutrients (Fertilizer) Space Carbon Dioxide What leads to diversity of plants and animals? Competition What happens when there are not enough resources for all the individuals in a population? The population will decrease in size until it is small enough that the ecosystem can support it. List three density-dependent factors in the environment Competition Predation Disease What happens if populations are not kept below carrying capacity? They may rapidly decline.

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