Respuesta :
Dr. Sanchez is explaining about germinal stage. The earliest and shortest stage of the human lifespan is the germinal stage of development.
A total of eight to nine days pass during the germinal stage. When an ovum and a sperm combine to form a zygote in a Fallopian tube, it starts (day 0). The zygote continues to go through initial cell divisions throughout the germinal stage, forming a solid ball of cells known as a morula (days 3-4). The process then continues as the morula goes through more modifications to become a hollow ball of cells known as a blastocyst (days 5-7). The blastocyst implants in the uterine endometrium, marking the conclusion of the germinal stage (days 8-9). The blastocyst is known as an embryo after implantation and will soon receive nourishment from the mother's blood through a temporary organ called the placenta. Nutrients must, however, be taken from cell cytoplasm or secretions in the uterus or Fallopian tube during the germinal stage.
Learn more about Germinal stage, here
https://brainly.com/question/26764173
#SPJ4
