. assertion (a): cell is an open system. reason (r): cell receives a number of materials including energy containing nutrients from outside.

Answer :

Answer:

Both A and R are true and R is the correct explanation of A. An open system is the one, which is separated from its surroundings by a boundary that allows the transfer of materials and energy across it. Cell is an open system because it receives a number of materials including energy containing nutrients from outside

Explanation:

please make me brainliest