Look at the scissors. which simple machines make up scissors?

a.
one lever and two wedges

b.
two levers and two wedges

c.
one inclined plane and two wedges

d.
two inclined planes and two wedges

I believe the correct answer from the choices listed above is option B. The blades of the scissors are a pair of wedges in a cross shape which pivot around a fulcrum. The attached handles are levers. So, two levers and two wedges

Independent variable is something that is changed in a experiment. 

It is the areas with lines. this may sound a little confusing, but i hope it !