An organ which regulates buoyancy who one answer this question I'll give her or him answer as brainlist answer it's my promise
but u have to answer it in 20 seconds

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this

her affection for her parents makes her an especially sympathetic character.