I came across a law in Ecology, that states that the mass and energy of an ecosystem are conserved.
Source: Law-4 of pg-35
Ecosystem is an open system, the conservation of mass and energy shouldn't apply to it. Isn't it?
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It's a different field of subject, so borrowed statements like 'mass and energy is conserved' should be taken with a pinch of poetic salt. You are correct in that ecosystems (as found on Earth) are open systems and conservation of mass and energy doesn't apply.