A and B together built a wall in 60 days. Is А A is for twice as good a workman as B in how many days will A alone finish the work?
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Step-by-step explanation:
biological community of interacting organisms and their physical environment.
"the marine ecosystem of the northern Gulf had suffered irreparable damage"
(in general use) a complex network or interconnected system.
"Silicon Valley's entrepreneurial ecosystem"
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