Answer:
It contains two unrelated ideas.
Explanation:
Unrelated ideas are ideas that make no sense once put together. The Wilderness Society, at first glance, has absolutely nothing to do with donating blood. Therefore, it would make for a poor statement to support donating blood. What should be done, is to replace that statement with the institution, organization, etc, that actually receives the blood donated, give more information about how it would be to donate, where does that blood goes to, how many lives could be saved, information about the body process after donating, etc etc.
Answer:
C
Explanation:
I'm hope I am right. and helped
Answer:
Retrospective cohort study
Explanation:
A cohort study is the study where people are grouped according to the factors they have been exposed to. The cohort is the group.
A retrospective cohort study is the study where the cohort who has been exposed to certain factors is compared with another cohort who has not been exposed to the factors that the first cohort has been exposed. This study is a long term study.
Here, the people's health of those that have been exposed to benzene will be compared to the the people who have been working there after 1970.
Hence, here a retrospective cohort study will be done.