Select the correct answer. Which form of birth control could people use without altering hormonal systems or blocking sperm from fertilizing an egg

Fertility awareness

Explanation:

Fertility awareness involves the woman being observant about different pointers during her menstrual cycle. This method is not the safest.

Studies have shown that a woman is less likely to get pregnant few days after completing her menstruation but very fertile around 12-14 days before her next period comes up.

This form of birth control doesn’t involve altering hormonal systems or blocking sperm from fertilizing an egg

the answer is:

carbon dioxide