What should scientists do after completing a scientific investigation?
a write a hypothesis
b confirm the results
c design the procedure
d make observations

The correct answer will be option-B.

Explanation:

A scientific investigation is a systematic and empirical way to answer the scientific questions of the natural world. The investigation involves the sequential steps which help provide the data to be used as evidence for the natural answers.  

The investigation follows the scientific method which begins with making an observation, performing experiments and suggest the conclusions. After completing the investigation, the investigation is followed by analyzing the data and confirming the result by peer-review fellows.

Thus, Option-B is the correct answer.

your answer is "the 1950's"

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."