Two types of measurement that would be needed to make during experiments are:
i. Instrument measurement – while carrying out an experiment, we need to write the data shown on the instrument in order to infer the results. Even the data in points should be noted.
ii. Measurement of error - no instrument is perfect. Therefore, before starting an experiment we need to measure the error of the instrument. Calculating the error would help in getting approximately correct answer.
One example of a positive feedback loop in childbirth is contractions. When the contractions start, they produce oxytocin, which stimulates stronger contractions, which produce more oxytocin.
