Primer plano de una placa de Petri con una muestra de plantas de un estanque para la investigación en manos de un trabajador de laboratorio, vista superior, sobre un fondo de agua - Foto e imágenes de stock

The scientist, in protective gloves and uniform, collects material from the water in a Petri dish

Close - up of a Petri dish, with grown plants, in the laboratory, the hands of a scientist planted in the environment

A water sample from the river. Hand in glove collects water in a test tube. ecology concept

A water sample from the river. Hand in glove collects water in a test tube. ecology concept

A man in a protective suit stands in a river and pours water from a test tube into it with a reagent to analyze the level of pollution

Scientist's hand, in a protective suit and gloves, pours liquid from a flask into a pond

A laboratory assistants hand in a rubber glove pours a blue reagent from a flask into a test tube with water to analyze the level

Hand in blue in a protective glove, pours liquid from a test tube into a riverbed

Hand scientist, in a protective suit and gloves, collects water in a glass tube for testing

A man crouched in a protective suit to take a sample of a plant from water into a Petri dish for laboratory research

A man in special protective clothing and a mask draws water from a river into a flask after discharges into the river, checking the river for environmental friendliness

Scientist in yellow protective vest, uniform and gloves, collects materials from water, tweezers Petri dish

Specialist in a protective suit, is measuring the instrument on the pond, close-up