Question

The oxygen concentration at the floor of the deep ponds n lakes is very low because of

Answer 1

warm water has less dissolved oxygen than the cold water so it is very low because the temperature at the deep on is high then at the surface

Answer 2

Answer:

Oxygen dissolves into water from two sources: the atmosphere and from plants in the water. The primary source of oxygen for a pond is from microscopic algae (phytoplankton) or submerged plants. In the presence of sunlight, these produce oxygen through photosynthesis and release this oxygen into the pond water.