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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