question 18\nan example of a positive feedback loop _______.\nare birds migrating south in response to…

question 18\nan example of a positive feedback loop _______.\nare birds migrating south in response to colder temperatures\nis a thermostat turning on the furnace as the temperature drops\nis a pond becoming more acidic as a result of pollution\nare predators eating most of their prey and then declining in numbers\nis melting arctic snow exposing dark surfaces that heat up and cause further melting

question 18\nan example of a positive feedback loop _______.\nare birds migrating south in response to colder temperatures\nis a thermostat turning on the furnace as the temperature drops\nis a pond becoming more acidic as a result of pollution\nare predators eating most of their prey and then declining in numbers\nis melting arctic snow exposing dark surfaces that heat up and cause further melting

Answer

Brief Explanations:

Positive - feedback loops amplify a change. Melting arctic snow exposing dark surfaces that heat up and cause further melting is an example as the initial melting leads to more melting. Birds migrating is a response to changing seasons, a thermostat is a negative - feedback mechanism, a pond becoming acidic is a one - way change due to pollution, and predator - prey dynamics are a complex ecological interaction but not a positive - feedback loop in the same sense.

Answer:

E. is melting arctic snow exposing dark surfaces that heat up and cause further melting