In the $Freemartin$ condition,which of the following is true?

Which two events in the life cycle maintain the same (constant) number of chromosomes?

Select the incorrect statement.

Given below are two statements:
Statement $I:$ Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.
Statement $II:$ The cavity of the cervix is called cervical canal which along with vagina forms birth canal.
In the light of the above statements,choose the correct answer from the options given below:

The period between $12$ and $18$ years of age in a person is known as adolescence.

Which of the following is not a secondary reproductive organ?