What is so fragile that saying its name breaks it?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

How many triangles can you find in this given picture?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

I have branches, but no fruit, trunk or leaves. What am I?

If 1+9+8=1, what is 2+8+9?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

How many times can you subtract the number 5 from 25?

What does the below image rebus riddle means ?