Name the life process of an organism that helps in the growth of its population.

$(a)$ Trace the path of sperms from where they are produced in the human body to the exterior.
$(b)$ Write the functions of secretions of the prostate gland and seminal vesicles in humans.

Can you consider cell division as a type of reproduction in unicellular organisms? Give one reason.

The number of chromosomes in parents and offsprings of a particular species remains constant due to

What are the benefits of using mechanical barriers during sexual act?

Define variation in relation to a species. Why is variation beneficial to the species?