A sentence must have a subject and a predicate, although the subject may be understood (you) in a predicate-only command (e.g. Stop! meaning you should or must stop).
essentially it breaks up a sentence whilst linking each separated segment of the sentence with each other:)
Your question is written incorrectly. It should be: Each of these apples is ripe. The subject is Each (singular), so the verb must be singular, is. This is a singular sentence.
Make each fragment into a complete sentence.
Each snowflake is unique.
It is for your topic sentence
Yes, 'Be sure to include each word's definition', is a command sentence.
Each opinion is important. Let each of us behave.
Make sure that each sentence is clearly enunciated so that the audience can hear what you are saying.
This sentence is a comparative sentence.
Example sentence - There were quite a variety of puppies in each of the kennels.
An adjective or a pronoun, depending on sentence structure.
Each sentence in a paragraph should support the main idea or topic sentence of that paragraph. The supporting sentences provide details, explanations, examples, or evidence that further develop the main point or thesis statement. Together, these sentences work together to convey a coherent and cohesive message to the reader.