The following article is by John Garratt and Brian Mattinson . Writing is one of our indispensable means of communication. For undergraduates it is also one of the means by which their understanding of their subject is assessed.
Effective writing is therefore an invaluable skill.
You can also learn by reading widely and thinking critically about the quality of what you are reading. But you need constant practice to develop the clarity and conciseness of style that is essential to good scientific writing. When you have thought clearly, you have never had any difficulty in saying what you thought. All writing needs a structure whether or not this is made explicit by the use of identified sections. In scientific writing, the use of formal devices like subheadings, tables, figures and diagrams is nearly always appropriate.