So basically , a latte machiato is nice when it is at a high temperature , but when it cools down , its different layers settle down peacefully. Well , is it safe to let it cool down?

Yes, you can have a latte macchiato both hot or cold.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

the answers are a and c