How do adaptive traits affect individuals vs non-adaptive traits?

What would be an example of hypothesis for goldfish respiration lab

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which of the following statements most accurately describes convergent evolution? the process in which two similar species evolve separately from each other and share similar characteristics the process in which a single species evolves into two or more new species the process in which two entirely different species evolve in response to each other the process in which two different species evolve separately from each other but still share similar characteristics