Hello anyone have the answer for Newton's Third Law of Motion

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Which best represents the law of conservation of mass ?