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Ecosystem: A community of living organisms.
Friction: Force resisting motion.
Gravity: Force attracting objects.
Hypothesis: Educated guess in science.
Inertia: Tendency to resist change.
Joule: Unit of energy.
Kinetic energy: Energy of motion.
Lever: Simple machine.
Momentum: Mass in motion.
Newton: Unit of force.
Osmosis: Diffusion of water.
Potential energy: Stored energy.
Quantum: Small unit of energy.
Reflection: Light bouncing off.
Speed: Rate of motion.
Thermal energy: Heat energy.
Uniform motion: Constant speed.
Velocity: Speed in a direction.
Work: Force over distance.
Xylem: Plant tissue.
Yield: Breaking point.
Zoology: Study of animals.
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