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Free body diagram. Normal force load, weight mass gravity. Identifying action reaction forces friction example. Wooden box, package. Newton's second law. Illustration vector
Expansion of universe vector illustration. Universe consist of three of substance. normal matter, dark matter, dark energy. Physics study material for students and teachers. Gravitationally unbound.
Chronic obstructive pulmonary disease (COPD). Comparison between normal bronchus and alveoli with bronchitis and emphysema. Human respiratory system.
Problems and health, normalizing of functionality of stomach digestive tract. Icons set of 10 pictograms in thin line
Skin conditions and problems, skincare and dermatology concept

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