Foto ecologista de espalda y traje protector con frasco con agua en las manos en la orilla del río - Foto e imagen de stock

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

Chemist looks at flask with water sitting on river bank

Photo biologist takes water for examination in pond

Scientist in chemical protective suit with conical flask taking sample from river for analysis

Ecologist looks at flask with water sitting on river bank

Photo biologist from back and in protective suit with bulb with water in hands on river bank

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

Laboratory assistant in respirator holds flask in hands on defocused background

Laboratory assistant with test tube, thumb up, blurred background

Chemist in respirator with test-tube, thumb up, on blurred background

Lab assistant with test tube, finger down, blurred background

Photo of hand in blue glove with test tube on blurred gray background

Chemist in respirator and blue gloves with test tube in hands takes sample of water near lake shore

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

Ecologist in respirator with test-tube on blurred background