The probability of a child with the phenotype of A will be 25%
It is because convergent evolution represents the independent evolution of similar features in species that don't have the same ancestor. In this case filamentous body forms evolved independently, but have the same function: an adaptation for a nutrition of decomposers.
Your answer would be D. Carbon monoxide. Everything else pollutes the water
Is there anything else that goes with this question? I’m not sure how to answer.