Explain the following concepts:

Asexual – sexual reproduction.
Mitosis — Meiosis
Diploid – Haploid
Gametes
Fertilization
Zygote
Syngamy
Blastocyst
Implantation
Gastrulation
Embryo – Fetus

Explain fertilization process from cellular level to fetus (as per video time 1:08:00)
After learning about fertilization process, and according to nature and objectively, and scientifically speaking, when does human life begin? Why?
Read and summarize Ethical and Religious Directives for Catholic Health Care Services (ERD) PART FOUR Introduction.