Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

I know a nine-letter word having only one vowel.
Do you ?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

A newspaper is supposed to have 60 pages.Pages 14 and 21 are missing from the newspaper.

Can you tell me , Which other pages won't be there as well ?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?