Secondary aquatic animals have a more or less stream lined body contour. Neck constriction disappears. Tail enlarges to take a shape like that of fish tail, aquatic Cetaceans, Sirenia and Pinnipedia. hope this helps!
Here's an example of a hook that you could use for your topic:
"It's now or never."
You may have heard this saying before, but have you really thought about its meaning? If you don't take a chance, you may never have the opportunity to work towards making your dreams come true. It is vital to take chances: otherwise, what's the fun in trying so hard?
Answer:
A synecdoche is naming the whole based on part. A or C fit this well.
