well since they deleted my answer, you're on your own kid. Goggle it, you will find the answer right away.
Hello there! I personally believe the answer will be:
the contents of a new textbook
The other ones seemed rather informal. Weekend plans with friends have no formality at all. As do the places to shop online for new shoes. The last one could be a candidate but it seems like something you would talk about with a friend or family member. Not so much your boss!
Hope this helped!
Vestigial usually refers to traits which over evolution have lost their main function and are less useful than they once were.
In number one Hunter means that he thinks the teeth were from the ancestor whale shark but are now useless or nearly useless to the current whale shark.
