Those are called "Creepers". They approach you quietly, then explode. Kill them using a bow or sword (These are most effective). They will also make a noise when their next to you. The sound is like hissing (sssssssss)
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No, there is no such thing. It sounds like something someone has made, like a large statue made out of green wool.
There is no such thing in Minecraft as a duplicator unless you get a mod.
There is no such thing as 'straw' in Minecraft. So you can't.
There is no such thing as an emerald pickaxe in Minecraft.
A game called Eden it is a game like minecraft except you play like in creative mode in minecraft