Pleaseee help.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

What is another way to determine mass times acceleration?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i