Only a single sperm cell can successfully make the journey up a woman's Fallopian tube to an unfertilized egg

To enhance your self-confidence, you should make comparisons when you first acquire a skill so you will know how much you need to improve regarding this skill

Indicate whether this statement is true or false.

Scientific theories must be subject to empirical scrutiny, that is to say, they must be ____________________

Fill in the blank(s) with correct word