Like animals grow they develop in our body
Humans do not have an exoskeleton that doesn't grow along with our bodies like crabs and other arthropods do. Our skeletons are inside and grow right along with the rest of us as we age.
We have skeletons so that we don't look like a big glob.
Animals have skeletons so they don't wobble about like jelly! Just like humans
the skeletons of millions of tiny dead organisms
Yes, they do in deed. It's just like how us, humans, also have internal skeletons. Therefore, internal skeletons have bones.
Chondrochthyes, i.e., the cartilagenous fishes, like sharks, posses cartilagious skeletons.
Jellyfish have no skeletons so they don't need to worry about it.
Animals are limited by the weight of their internal skeletons, plants dont have one - so can grow indefinitely.
pH is important for many reasons, but for coral reefs proper pH is especially important because of how corals grow. Corals grow by depositing calcium carbonate as part of their skeletons, and calcium carbonate does not like to for (precipitate) at lower pH. A pH of above 8 makes it much easier for corals to lay down there calcium carobonate skeletons, and thus makes it possible for them to grow. That is how pH affects coral reefs.
Skelanimals are toys that look like skeletons.
Bone. The same as yours. Sharks have cartilaginous skeletons, but whales are mammals, with skeletons like humans or dogs or elephants.
This enchantment harms undead creatures like skeletons, Zombies, wither skeletons, zombie pigmen, and wither. It adds 2.5 hearts of damage to each of your hits.