Question

17 multiple choice 5 points a scientist will repeat an investigation many times before finally making a conclusion. which reason best explains why a scientist repeats an investigation? repetition is needed to prove a hypothesis. repetition is required to publish a conclusion. repetition ensures the accuracy of obtained data. repetition helps scientists remain objective about observations. 18 multiple choice 5 points an experiment is described below. a large field at the base of a mountain becomes flooded when heavy rains in the mountains cause a stream to overflow. each time the flooding occurs, more soil washes away. the owners of the land want to perform an experiment to see if different types of plants could help reduce the soil erosion. they choose five areas of ground that are the same size, the same distance from the stream, have the same slope and the same kind of soil, and receive the same amount of sunlight. the type of plant planted in each area is different for each of the five areas. measurements of soil erosion will be made each time flooding occurs. the results will be compared after six months. which hypothesis is being tested in this experiment? soil erosion is affected by the strength of the wind. flooded areas have greater soil erosion than areas that are not flooded. some types of plants reduce soil erosion more than others. some types of soil are more easily eroded.

Explanation:

1. For question 17: Repeating an investigation helps ensure that the data obtained is accurate. Random errors or anomalies in a single trial can be identified and minimized through repetition.
2. For question 18: The experiment has five areas with different plants (the independent variable) and measures soil erosion (the dependent variable). The hypothesis being tested is about the effect of different plant types on soil erosion.

Answer:

1. Repetition ensures the accuracy of obtained data.
2. Some types of plants reduce soil erosion more than others.