When the ice on the surface of a pond melts, which changes benefit the ecosystem in the pond?
1 The melted water sinks to the bottom of the pond.
2 The water from the bottom of the pond brings dissolved minerals to the surface.
3 Warmer water dissolves more oxygen for the aerobic organisms.
1 )
1, 2 and 3
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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