Answer:
The Urinary bladder, the ureter, and the urethra are all organs that belong in the execratory system.
The heart and spinal chord are not organs in the execratory system. The spinal chord belongs to the nervous system and the heart belongs to the circulatory.
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Answer:
A) vesicle
I think this is the right answer, i may be incorrect.
I guess the answer is B !! as it has no relevance and is not an observation !!
I believe it is either fish of plants (Most likely plants).