Many pesticides last a long time. The amniotic fluid is the fluid that surrounds a baby while it develops within the mother s womb. It was once thought that toxins such as pesticides could not cross the placental barrier and affect children, but this evidence proves otherwise. Effect of pesticides on children vary, but are likely to cause difficulty paying attention, poor short and long term memory, below average reading comprehension, lower IQ scores. These symptoms were found in children whose mothers ate fish from Lake Michigan in the years prior to their pregnancy.
Pesticides also travel around the world, accumulating in the poles and other regions.
These same two midwestern compounds are falling as rainfall in Europe at concentrations that would be illegal in drinking water. In every population of a species, there are individuals who are more or less immune to pesticides. Those who are more immune will be more likely to survive pesticides. They will also be more likely to reproduce successfully. Over a period of pesticide use, the pest population will become more and more resistant to pesticides requiring farmers to use either a larger volume or a more toxic pesticide.