What are the following may I ask ?
Because they interfere witht he natural cycling of elements.
An example is crop harvesting. The practice of removing part or all of the crops grown from the soil accelerates the loss of nutrients from the soil. The cycling of nutrients from plant uptake and release is interrupted by crop removal.
Hope this helps!
Sorry i don't understand your question. I am really confused.
In general, more complex animals are More likely to likely have a digestive tract than to have a gastrovascular cavity
Since it is really unlikely to have a set of digestive system if you are only a single cell organism
