Different phenotypes from around the world

What was the land like over 500 million years ago? what was under the sea?

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

Any sound above what db can cause hearing loss in human beings