Transcript of Heart Disease and the Excretory System. Heart Disease and the excretory Heart disease slows the oxygen flowing throughout the body. So oxygen moves slower to the excretory system.
The most likely causes of a shift in pH are: 1  Something in the water source buffering the water. 2  Something in the tank buffering the water. 3  or Something you are adding to the tank.
Hi Patsy, the tinge is probably overflow from the rainwater either spilling into the pond or if it was a heavy rain, then the rainwater would splash into the pond. The dirt will give it a slight color. Remember that ponds do go through cycles and they are not swimming pools.here are two inter-related factors to consider before deciding to use rain water for fish: pH values affect fish health considerably. The typical pH of rain water is about 5 â 6. However industrially produced sulphuric oxides and carbon monoxide in the atmosphere can reduce the rainâs pH to 4 or below.