Question

why does the fertility awareness - based contraception method have a higher failure rate than most other birth control methods? multiple choice variations in a person’s cycle may make it more difficult to track fertile days. the method requires abstinence for most days of the month. basal thermometers are less accurate and are unpredictable. pregnancy can occur at any time because sperm stays viable for about 30 days.

Explanation:

Fertility awareness-based methods rely on tracking fertile days, but menstrual cycles often vary (due to stress, health, etc.), making accurate tracking hard. This variability leads to misidentifying fertile periods, increasing failure rates. Other options are incorrect: abstinence is only needed on fertile days (not most), basal thermometers are accurate if used properly, and sperm viability is ~3-5 days (not 30).

Answer:

Variations in a person’s cycle may make it more difficult to track fertile days.