Question
Even though living cell is independent from external environment, it can exchange materials with it.

Answer

$-$In each living cell the cytoplasm and the nucleus are enclosed within the cell membrane.
$-$The cell membrane seperates cells from one another and also the cell from the surrounding medium.
$-$The cell membrane is porous.
$-$The cell membrane allows the exchange of materials with external environment through pores.
$-$So, even though living cell is independent from external environment, it can exchange materials with it.

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