Degrees Universal Drop

Q3 The tea leaves in a tea bag contain colours and flavours that dissolve
in the tea. Why is it difficult to make iced tea using a tea bag dipped in
very cold water?

Q4 When you put a tray of water in the freezer its temperature drops at
naught degrees Celsius. The temperature then stays the same until all the
water is frozen. What is happening?

Q5 Two fossils are found in 2 different layers of rocks, one above the
other. Which fossil is likely to be the older one, explain your answer.

Q7 a solution turn red with universal indicator what does this tell you
about the solution?

please answer one or more of these questions. or all. that would be good too:)

thanks for the help!