The jones family gas had their dog, Sadie since she was a puppy. Sadie was raised in the home, which has a letter carrier visit
at the same time ever day. Though Sadie used to bark and scratch the door when the letter carrier deopped off packages, now she doesnt even wake up from her nap when the letter carrier comes. Sadie is demonstrating a learned behavior that she acquired through what method? a) habituation
b) trial and error
c) imprinting
d) mimicry
Habituation is the adaptive learning behaviour in which the response strength is reduced when stimulus is given repeatedly. Barking and scratching of door by the dog was the response towards arrival of letter carrier. However, repeated visits of the person at the same time reduced the strength of response through the process of habituation.
By the beginning of the 20th century, researchers thought that plastids and mitochondria could come from bacteria. These would have been ingested by primitive cells and live within them in symbiosis.
