DDT and other pesticides used over 50 years ago are still affecting the environment today. Scientists have found these substances in recent glacier runoff. Glacier runoff occurs during the summer, when precipitation that has fallen on glaciers during the winter is released. Ice layers from existing glaciers have been analyzed. The results of this analysis show that the concentrations of DDT and other pesticides were highest about 10 years after the use of these substances was banned. This information shows that:

CLASSIFICATION OF PLANTS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	DDT and other pesticides cause glacier runoff during the summer
B	it takes humans over 50 years to analyze a glacier.
C	precipitation helps to break down pesticides.
D	the decision of one human generation may have an impact on future generations.

Explanation:

Detailed explanation-1: -DDT and other pesticides used over 50 years ago are still affecting the environment today. Scientists have found these substances in recent glacier runoff. Glacier runoff occurs during the summer, when precipitation that has fallen on glaciers during the winter is released.

Detailed explanation-2: -DDE decreases the reproductive rate of birds by causing eggshell thinning and embryo deaths (14). DDT is highly toxic to aquatic animals (14). DDT affects various systems in aquatic animals including the heart and brain (14). DDT is highly toxic to fish (14).

Detailed explanation-3: -Ice layers from existing glaciers have been analyzed. The results of this analysis show that the concentrations of DDT and other pesticides were highest about 10 years after the use of these substances was banned. This information shows that. DDT and other pesticides cause glacier runoff during the summer.

Detailed explanation-4: -DDT is a persistent organic pollutant (POP). It is made by humans and does not occur naturally in the environment. DDT was used as an insecticide to prevent the spread of disease and to protect crops.

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