Signs and symptoms of may include feelings of sadness, guilt, worthlessness, and hopelessness.

The answer is MDD.

Explanation:

Major depressive disorder (MDD), refers to a mental disorder in which there are at least two weeks through which there is a presence of low mood related to most of the situations.

This disorder is also known as depression. Some of the symptoms concerning this disorder include loss of interest in normally enjoyable activities, low energy, as well as the presence of pain without a relevant cause. People with this condition can also have false beliefs or perceive some things that others cannot.  

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.

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.