Answer:
D. cell theory
Explanation:
According to my research on studies based on genetics and biology, I can say that based on the information provided within the question the idea being described in this situation is called Cell Theory. This theory (like mentioned in the question) states that all living organisms are made up of cells, which are the building blocks of all organisms, and that these cells come from pre-existing cells.
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The unusable food inside our body, comes out in the form of sweat or from the excretory system- [ when we go to washroom ]
Answer: kidneys
Explanation:
The kidneys remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. This is done with the help of millions of nephrons present in the kidney.