For each comparison slide, click in each bullet list and add a green animation.
You should see a number beside each bullet on your slides.
In the Animation Pane, expand the lists by clicking on grey bar(s).
Select the picture for the Like list and add a green animation.
In the Animation Pane, change the Start of the Picture animation to With Previous, so there's no mouse beside it.
Then drag it up so it's under the matching bullet. The picture should now have the same number on the slide as the bullet.
Do the same steps for the Like picture for the other comparison slide.
For both comparison slides:
So if you Preview your slides, they'll look something like this...
Keep your Animation Pane open and get your work checked off.