Distance is defined as:, a) The total length traveled by an object  , b) The change in position over time , c) The speed of an object in a direction , d) The rate of motion, Velocity is different from speed because it includes:, a) Mass  , b) Direction , c) Energy , d) Distance, Which of the following is an example of velocity?, a) 20 m/s  , b) 20 m/s north , c) 50 km , d) 30 m/s², The law of conservation of mass applies to which type of reaction?, a) Open system reactions  , b) Chemical reactions in a closed system  , c) Reactions involving nuclear changes  , d) Reactions where mass is gained, In a closed chemical reaction, if the total mass of the reactants is 100g, what will the mass of the products be?, a) Less than 100g  , b) More than 100g , c) Exactly 100g , d) Unpredictable, What is the term for the transfer of energy and matter through different organisms in an ecosystem?, a) Photosynthesis  , b) Food web , c) Respiration , d) Decomposition, How do producers obtain energy to make food in an ecosystem?, a) By consuming other organisms  , b) By absorbing energy from the sun , c) By extracting energy from soil , d) By breathing in oxygen, What is the primary source of energy for most ecosystems?, a) Water  , b) Sunlight , c) Air , d) Fossil fuels, What is the process by which green plants convert sunlight, carbon dioxide, and water into food and oxygen?, a) Respiration  , b) Decomposition , c) Transpiration , d) Photosynthesis, Which of the following organisms are considered primary consumers in an ecosystem?, a) Herbivores  , b) Carnivores , c) Decomposers , d) Producers.

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