An acid can be considered a substance that a proton

Idont know. if you want an answer you need to give us some context dude.

For a collision to be successful you need 2 different objects 

Hello! mitosis and meiosis are the same, because they are both ways of dividing cells and reproducing cells. they are different in many ways, but the main one is that meiosis splits the number of chromosomes in 1/2, while the number of chromosomes remains the same for mitosis. plus, meiosis has two stage of division, unlike mitosis, where it has only one.