Answer:
C) redundant organs present in an organism, which have been functional in the organism’s ancestors
Explanation:
Vestigial organ are bodily organs which are retained in the evolution however over a long period of time have lost their original functions and become reduced in size due to changes in the living habits. They serve as the evidence of evolution. They include caecum and appendix; coccygeal vertebrae
The organs that are involved in the excretion of water from the body include:
1. Kidneys (Primary organ for water removal)
2. Skin
3. Lungs
The kidneys play a key role in maintaining the water balance of the body. The kidneys control the water levels in the body by conserve water when there is shortage, and they can expel excess water by diluting the urine.
The skin has water in it. This water gets lost to the atmosphere by the process of evaporation. This is independent of the process of sweating wherein the skin actively releases water in the form of sweat to cool the body.
Our breath has a lot of moisture in it. This moisture is present due to the evaporation process taking place within the lungs due to the heat of the body. Thus lungs also become a part of the water loss mechanism.
3-6 month stage if I understood what you are asking correctly
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