Scientists usually write reports about their investigations. why do they do this?
a. to classify results
b. to ask questions
c. to perform experimental trials
d. to communicate their work to other scientist

As for me, the reson why scientists usually write reports about their investigations is because they want to d. to communicate their work to other scientist. As far as I am concerned in this sphere they have to get many other opnions besides their own in order to complete or expand one that they have made up. Hope it helps :)