No creatures live in lava, lava damages all mobs in the same way as normal people.
No organism can live in lava. It is too hot.
You can find lava underground.
Yes, bedrock will block lava.
no
The Minecraft block ID for lava is 10 or 11 for stationary and flowing lava respectively.
Lava layer is around 12-14
The most common creature in minecraft are cows, pig, chickens and shepp. But it also depends on the seed
All seeds have lava lakes
1: go mining 2:find lava 3:profit
You can't MAKE one, but you can collect lava with buckets.
Yes.
Use a bucket