John has been diagnosed with alzheimer's disease. while he is quite forgetful, he is still able to recall events from his teenage and young adult years. that is because his is still intact.

Long-term memories.

Explanation:

Alzhemer´s is a diseases that damages the memories and eventually damages the way in which people beheave, this is because eventually it causes dementia, it´s is a progresive disease meaning that it starts slowly and develops over time, often people start by not being able to remember short term memories, and it slowly develops over time where their long term memories also are forgotten.

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

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