I believe the answer you are looking for has to do with cells, they are the basic building block of life and are the smallest life that can support itself.
The excretory and urinary are not the same because the excretory system is collective for all system performing the function of eliminating waste from the body like excess water,urea, carbon dioxide and lactic acid but the urinary system focuses on removal of excess water and urea from the body
Evolution is when living things go through changes. This occurs through natural selection.
Are there answer choices? The only thing you can see change is the size and the pattern slightly changed.
