B since life cant always be the same and the other 3 you can control and look after
Answer: Organelle
Explanation: A nucleus is an organelle that functions as the cell's brain, regulating its production of proteins and genetic material. The nucleus governs the cell's production of these substances by means of its deoxyribonucleic acid or DNA. ... It contains information that determines the cell's purpose and function.
It is true! Contaminated groundwater is very difficult and sometimes impossible to purify!
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