The cell is the fundamental unit of life and requires certain basic functions, including:
1. a boundary that distinguishes inside from outside the cell yet allows materials to enter or leave the cell.
2. an "engine" to capture energy from the environment and convert it to a form useful to the organism.
3. a genome that can be transmitted to the next generation and is stable, but able to change.
4. a way to change in response to environmental changes, over both a short (individual organism) and long (generational) time frame.

Explanation:

A boundary that distinguishes inside from outside the cell yet allows materials to enter or leave the cell.

The cell needs a barrier for protection, rigidity and also for easy transportation.

ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.

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