Read the incorrect sentence. write three to five sentences explaining what kind of run-on sentence it is and how to revise it. my mother and father are both scientists, it must have been my destiny to become interested in biology.

This sentence is incorrect because it contains a comma splice. A comma splice is when a comma is used to separate two independent clauses. In order to fix it, the comma should be replaced with a period or a semi-colon, as seen below.

My mother and father are both scientists. It must have been my destiny to become interested in biology.

My mother and father are both scientists; it must have been my destiny to become interested in biology.

A sentence can be defined as the set of words framed in a systematic manner with the proper use of punctuations, tenses, proper use of subject, verb, agreement, and clauses.

A sentence can be said as incorrect if any of the above-mentioned things are used incorrectly or are missed.

The given sentence is incorrect due to a single reason that is it contains a comma splice between two sentences. The comma splice is usually used to separate two independent clauses, but in this case, the following sentence has a dependent clause.

To sentences can be revised by using either full stop between the sentences or using semi-colon.

Therefore the use of comma splice makes the sentence incorrect.

For more information about sentence formation, refer to the link:

link

in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )

i agree, but what is the question here?

explanation: