In Chapter One of the book by Jack Davis, he states that unlike many indigenous people that used materials of terrestrial origin to create tools and art, the native peoples of the Gulf coast used items that were more common in their surroundings$-$items from the Gulf. Which of the following are examples of this mentioned in the book? More than one answer may be correct, choose all of the correct answers.

a$.$ Warriors armed themselves with spears made of alligator bones, fish bones, and stingray spines.

b$.$ They ate a type of dry, ground fiber made from saltmarsh cordgrass as their primary carbohydrate, instead of rice or grain.

c$.$ Shells were used as dippers, spoons, bowls, hammers, awls, and digging$/$hacking tools.

d$.$ Fishing nets made of woven palm fiber were weighted with pierced clam shells.