In ,learning occurs when two types of events are paired closely in time.
a. operant conditioning
b. observational learning
c. classical conditioning
d. social learning

answer; cindy crawford tina feycarrie underwood///meryl streep;

all of them? if not search it up

it might look like that the ideal way to research the health effects of trans fats is through a controlled experimental feeding trial. but these kinds of trial have several important limitations that the researcher must look into:

short in duration (this factor usually checks up on the intermediary risk factors rather than the actual outcomes of the disease)

limited dietary changes

only makes use of healthy participants