Answer:
ovulation, fertilization, and implantation
development of an embryo and then a fetus
contractions of the uterus and dilation of the cervix
birth of the baby
expulsion of the placenta and cutting the umbilical cord
A lifestyle factor which doesn't affect physical fitness would be clothing - d. There is no real reason to suspect why clothing would play any important and real role when we're taking about physical fitness. What is true, however, is that our lifestyle largely does determine our clothing.
Exercise programs and sports activities can differ in number of participants from one person doing an activity like jogging or swimming, to hundreds of participants at a track meet. Structure can be loose in solo exercises where you can set your own pace, or be very strict in most competitive sports. Competition varies from none to highly competitive, and can be on an individual or team level. More complex sports and activities can present a high skill level.