It doesnt matter how long they are, their still fingernails no matter what.
Do you mean black claws or back claws? Well, the answer is yes, to both. Their claws are blackish-looking on the inside (although on the outside they are translucent like human fingernails), and yes, female red-eared sliders have both front and back claws, just like the males. The difference is that the claws of the male are usually much longer.
The rattle is made of keratin, the same group of substances that make up the human's outer layer of skin, fingernails, claws, horns, etc.
All birds Talons and Claws are also made of Keratin. The same as Human fingernails, Rino Horn, Porcupine and other such things.
A cat's claws are made out of the same material that human fingernails are made out of: Keratin. A cat's nails are constantly growing like a human's or a dog's, but grow in layers instead of length. Newly grown claws are covered by a protective outer layer that the cat removes by "sharpening" his claws. However, a cat's claw is firmly attached to first toe bone. This ensures that the claws cannot be pulled out during hunting, fighting or climbing. Tendons and special joints are what enable a cat's claws to retract and flex.
Depends on the nail. Toenail or fingernail?
No, fingernails are not digestible by the human body. They are made of a tough protein called keratin that cannot be broken down by our digestive system.
Calcium
Yes, both a cockroach's exoskeleton (skin) and human fingernails are made of a protein called chitin. However, the composition and structure of chitin in a cockroach's exoskeleton are different from the keratin in human fingernails.
No, fingernails do not digest in the human body. They are made of a protein called keratin, which is not broken down by the digestive system. Instead, fingernails grow continuously and are eventually pushed out as new cells replace the old ones.
To note a few things, dinosaurs had tails, and humans do not. Dinosaurs had snouts, unlike us. They also had claws, while we have keratin fingernails. Many types of dinosaurs had bony armor, horns, or headcrests, which humans do not have.
Human Brains. With fingernails.
due to cuticle and protein keratin