My parents took me and my older brothers to see this film at a movie theater in Phoenix during the 1970's. Movies were a novelty for me at the time and what I saw in this movie (even as a child) was incredibly fascinating and amazing!!!
It showed and discussed reproduction as a natural part of life as well as, death and what happens after death. Seeing this film without any fear and the innocence of a child was a blessing. Because of it, I learned early on what happens to our physical bodies and how the "cycle of life" works and continues. I believe it's helped me accept the deaths of family members, friends and pets over the years.
Be aware, it is a graphic film but ultimately extremely educational!!! This is a film that every curious, intelligent person should see.