Which new deal program has been modified by over 20 different amendments?
a. federal deposit insurance corporation

b. social security act

c. national youth administration

d. tennessee valley authority

B Social Security Act

Explanation:

The Social Security Act was passed in 1935. It was created to help the older generation save money through taxes on their wages. This system is very much still used, although it has been amended over twenty times. And i just did this in study island.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.