Which of the following statements about developing the conclusion of a scientific study is true? O No part of a scientific study can be considered to reach a conclusion,
O Reaching a conclusion in a scientific study means future study is no longer viable or necessary.
O Sociologists study very focused subjects in order to be able to answer all questions about it.
O The conclusion of a scientific study functions as both an end and a beginning.

the conclusion of a scientific study functions as both an end and beginning

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.