If you want to keep yourself protected from the monsters, you need to build shelters.
Unfortunately, there are a few new additions, like a Deep Dark biome, that got pushed to the 1.
Also, there are several underwater dripstone caves that you can stumble upon in the 1.
For many years, Minecraft has been an increasingly popular sandbox game.
This means microbiomes are more likely to happen again, but they will usually be of matching temperatures for example a small forest inside a plains biome.
Other Major Changes in Minecraft 1.