Which of these technological advances have improved flu vaccines

Cell-based culturing

Explanation:

If that is an answer Choice. Hope it helps you.

           - Elaine

you can't get pregnant from swallowing semen; the taste varies

explanation:

when you swallow semen it doesn't go into the vagina and fertilize the egg; for taste how ever that can be altered by what the man eats suck as pineapple can make it sweeter

answer; i believe the correct answer is (progesterone);