Question

Aisi kaun si chiz h jo Subah dekho to hari, dupahar mein dekho to kaali, shaam ko dekho to neeli Aur raat ko dekho to safed hoti h. Hint: ye lagbhag sbke ghar mein mil jayegi

Answer 1

maybe I think so it's an algae

Answer 2

Algae is the only thing which seems green in morning, black in afternoon, blue in afternoon and white in night.

This is the scientific answer
hope that this will help you
if you want further help you can ask me anytime

thank you