can you solve these riddles?

[ryan99]

two legs sat on three legs sat on 4 legs than no legs

it comes from within, is very thin and the same color as your skin

a mouse ran to a piece of cheese than disappeared. four days later, his brothers also disappeared. the mother wondered for days trying to find what happened and then she saw it. what was it?

i am as light as a feather and yet cause a high pitch upon entry

what is the next room in this order: black, white, turquoise, ?

two men with jet packs ate lunch when one man started to lose control of his rocket. upon further study, it was found that pickle juice had been poured inside, how did it get there?

[QUESTIONSLAYER]

third one: a mouse trap 5th one: their colours