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A hand holding a red ribbon, symbolizing AIDS and HIV awareness, raising support and promoting solidarity with those affected by the illness.
Climate affecting factors for earth weather condition causes outline concept. Labeled educational meteorology aspects with elevation, relief, latitude, currents and air masses vector illustration.
Factors Affecting the activity of enzymes: temperature, substrate concentration, pH, enzyme concentration
A sad young woman in pajamas with seasonal affective disorder or depression sits alone on the bed and looks out the window. The concept of winter depression due to lack of sunlight
PM 2.5 man wears mask to protect from bad weather pollution in the city small dust particle and dangerous allergies exceed safety standards PM2.5 , affects the lungs and respiratory tract health care.

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