I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I shave every day, but my beard stays the same. What am I?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

When it is alive we sing, when it is dead we clap our hands. What is it?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?