why was it necessary to can conquer and makwanpur in the unification Campaing of Prithvi Narayan Shah

To prevent help to the Kathmandu valley.

Explanation:

It was necessary to conquer Makwanpur in the unification Campaign of Prithvi Narayan Shah because Makwanpur helps by exporting goods to the Kathmandu valley which was against the policy of Gorkha. Makwanpur had control over the southern route which goes to the Kathmandu valley so they provide help to the valley so for that reason Prithivi Narayan Shah thought to conquer Makwanpur.

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.