Answer: ammonia
Explanation: Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste. Uricothelic organisms tend to excrete uric acid waste in the form of a white paste or powder
Sponges are in the Porifera phylum
The answer would be (B) because the pair of Guanine is Cytosine and the pair of Adenine is Uracil (It is paired with Thymine in DNA).