Spontaneous recovery demonstrates that: A. learning is greater the more CS-US trials are spaced in time.
B. CS-US pairings are not necessary for classical conditioning to occur.
C. extinction does not completely erase previous learning.
D. a stimulus paired with passage of time can come to elicit a response.

Monomers are the building blocks of larger molecules, called polymers. for example, proteins are composed of chains of amino acids that are linked together. cellulose is a polymer that makes up plant cell walls. cellulose is made from a chain of c6h10o5 molecules. which monomers are most likely used to produce cellulose? why?