Écologiste avec éprouvette et masque, combinaison de protection, doigt baissé, assis sur la rive de la rivière - Photo & image de stock

Biologist with test tube in mask, protective suit, finger down, sits on river bank

Chemist with bulb and raised finger sits on river bank

Photography of environmentalist for examination takes water in reservoir

Ecologist looks at flask with water sitting on river bank

Biologist with bulb and finger down sits on river bank

Ecologist with bulb and raised finger down on nature

Chemist looks at flask with water sitting on river bank

Photo of ecologist in mask, protective suit with test tube, thumb up, on river bank

Ecologist with bulb writes in folder on banks of river, blurred background

Ecologist in safety glasses and respirator holds flask with water in hands on street

Laboratory assistant with bulb in hand on river bank in summer

Laboratory assistant in respirator holds flask in hands on defocused background

Ecologist with bulb and folder on river bank, blurred background

Ecologist in respirator with test-tube on blurred background

Biologist in respirator with test tube, finger down, on blurred background

Biologist with test tube in hand on river bank