Food, shelter, water, are some things a squirrel will need to survive
The west Nile Virus is pathogen which caused the West Nile fever and encephalitis. The pathogen was introduced in 1999 in the Western Hemisphere and infected a major population in new york. It then expanded to 12 states and district of columbia. The major carrier of the pathogen was Avian and Mosquitoes species. In between 1999 to 2008, nearly 2500000 people were infected and nearly 1500 people died. Also there were thousands of cases of encephalitis or meningitis.
The answer to your question is B- introduction of non-native animal species
A resistor is a electrical component that implements electrical resistance as a circuit element. They are used to reduce circuit flows, adjust circuit level and divide voltages.