Foto de biólogo em máscara, terno protetor com tubo de ensaio, dedo para baixo, na margem do rio - Banco de fotos e imagens

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

Chemist with bulb and raised finger sits on river bank

Ecologist looks at flask with water sitting on river bank

Ecologist with test-tube and mask, protective suit, finger down, sits on river bank

Chemist looks at flask with water sitting on river bank

Photo of chemist takes water for examination in pond

Ecologist with bulb and raised finger down on nature

Photo biologist takes water for examination in pond

Lab assistant with test tube, finger down, blurred background

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

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

Laboratory assistant with test tube, thumb up, blurred background

Ecologist with bulb and folder on river bank, blurred background

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

Ecologist in respirator with test-tube on blurred background

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

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