The argument or the reason that Dr. Douglas used with Dr.
Brodus in allowing the Tuskegee study to continue despite of certain
circumstances was because of validation in terms of the autopsy in which he
stated that is needed in order to know whether the study is reliable and it is considered
to be science.
I have a strong belief that the answer is false.
Alluvial fans are formed by streams and deltas are formed by and found at the mouths of rivers. They are very similar but come from different environments.
Hope I was able to help :)