The frog species around the world have declined in number or due to changes in the environment and the extinction have consequences for the ecosystems in the frogs live.But have the methods have been proposed to solve the problem.
First, in the reading passage frogs are harmed by pesticides, prevent insects form damaging farm crops. The pesticides often spread from farmland in to frog habitats and enter a frogs' body. The harmful pesticides near sensitive frog population.In the listening the professor says the seriously reducing the pesticides in agriculture area, and stay competitive in the market. The frog population have follow stricter regulation regarding use .
Secondly, in the listening the professor says the statement must be applied individually to each frog the large scale is extremely difficult. In the reading passage, the major factor for population is fungus . The fungus causes the skin and will absorb the water, infected frogs die of dehydration. S o the treatment if applied on a large scale, will protect sensitive frog population for infection.