Which of the following is elaboration?

There are a wide variety of traits that aid sea life in surviving the brutal surroundings. Source one,
"Giant Squid (Architeuthis dux)," lists squid anatomy. The source states, "Largest eyes of any animal
on earth-great light-absorbing capacity."

They need to get inside the bone to feed off the nutrients inside. Instead of teeth or burrowing features,
these worms have the ability to burn through the strong bone.

To survive these harsh conditions the animals that reside in the depths of the ocean must have special
adaptations. These special characteristics that allow the survival of deep-sea creatures in the difficult
circumstances of the ocean are traits that help them navigate their environments, escape predators, and
capture food.

In Source two, "Zombie Worms Drill Whale Bones with Acid", tells about worms that secrete an acid to
help them break through the whale bones.