Ecological systems are usually –

1. Ecological systems are usually –

[ঢাবিঃ গ ইউনিট (ব্যবসায় শিক্ষা) ২০১৬-২০১৭ : 2017]

1. Sustainable

2. naturally beautiful

3. constant

4. stable equilibrium

5. changing over time

Answer

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