Choose "innate" if the behavior is an innate behavioral adaptation and "learned" if it is a learned behavioral adaptation.
a spider weaves a web.
a. innate
b. learned

a. innate

Behaviorism is a popular view in psychology concerning behavior and responses is said to be shaped by one's environment. 
One component of behaviorism is social learning theory which suggests that "behavior changes as a result of observing people in various situations".

There are other two views:
1. Classical conditioning
2. Operant conditioning

Ithink the answer is nuclear membrane