Alzheimer's disease is a form of dementia that causes problems with memory. Alzheimer's accounts of 60-80 % of dementia cases and interferes with normal life. It is not a normal part of aging, even though people think that old people are forgetful. Alzheimer's usually starts with difficulty remembering newly learned information. Memory loss is not necessarily Alzheimer's.
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The decline was attributed to a number of factors including Increased insect resistance, the development of more effective alternative pesticides, public and user concern about negative environmental side effects—and a government ban on DDT use since 1969--all contributed to the decline.
Lengths are to be measrued in meters
Nutria and zebra mussel are examples of Invasive Species.
