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Portrait of a Golden Retriever dog lying on its back on a bed with its ears raised up. The owner hands hug the dog head. Happy and calm pet. Funny dog on the bed.
Factors Affecting the activity of enzymes: temperature, substrate concentration, pH, enzyme concentration
Drought affecting an agricultural field in the countryside. Parched sunflower field. Deliberately blurred background.
A sad young woman with seasonal affective disorder lies alone on the bed and looks out the window, next to a domestic cat. Concept of winter depression due to lack of sunlight, selective focus
love words "I love you" in all languages of the world, word cloud background

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