Paragraph transitions connect the ideas in one paragraph to ideas in
the next paragraph. Writers other make a transition by repeating parts of
an idea from the previous paragraph.
Example
Last Sentence/Paragraph 3:
...But the public also has a great interest in science,as is shown by the
large audiences for science fiction.
First Sentence/Paragraph 4:
What can be done to harness this interest and give the public the
scientific background it needs to make informed decisions on subjects
like acid rain,the greenhouse effect,nuclear weapons,and genetic
engineering?