<span>the nucleus
I think ...</span>
It is chloroplast I guess because once i read that mitochondria has not much importance in being an autonomous organelle
meiotic devision this is the answer it might help you
All you need is :
one egg
vinegar
and a glass or bowl that is taller than the egg
tilt the glass when you put the egg in so it doesn't brake then pour vinegar in to cover the egg and watch as its shell disolves