How to make objects appear and reappear in a game?

For example, in Super Mario Bros, evil plants come out of the pipes.

How can I do that same effect with the plants and the pipes using Contruct2?

I want to make evil characters come out of some water pipes at certain intervals.

Maybe you can use the timing system or invisible,then visible.

Just a matter of timers and layers and movement. Throw in an animated sprite, and you're done.

Pipes are at 90% opacity so you can see the plant.

Uses LiteTween (extremely useful).

Thanks for the replies, guys. This really helps.