Its called direct examination
Answer:
Environmental etiology
Explanation:
environmental factors such as exposure to tobacco smoke and herbicides has been linked to increased risk off autism in children.
I believe this is called: <span> replication
Replication refers to the repetition of a study that has already been done in the past, but conducted with different situations or subjects.
The main purpose of this type of study is to find out whether the conclusion of the previous study could be applicated in different circumstances and held as a general standard.</span>
I believe The answer is A.a class system
Industrial Power gave them more efficient power sources, better weapons and better ammunition. Which in turn got them to win the Civil War.