Two contraceptive methods that are generally irreversible and which block the gametes from moving to a site where fertilization can occur are .

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

acceleration = 18/3 = 6 m/s per second.

hope i

-lavira: )