Each woman filled in a questionnaire about the extent of her hair loss and had her iron level (serum ferritin) tested. Among the women who described their hair loss as excessive, 59% had low iron stores compared to the remainder of the population. Decreased Serum Ferritin is Associated with Alopecia in Women.
The upper shell of the turtle is called the carapace. The lower shell that encases the belly is called the plastron. The carapace and plastron are joined together on the turtle's sides by bony structures called bridges. The inner layer of a turtle's shell is made up of about 60 bones. It include parts of the backbone and the ribs, meaning the turtle cannot crawl out of its shell.
Most turtles have shells like houses that they can pull their heads and limbs into. But a sea turtle can't pull into its shell at all. The shells of most kinds of sea turtles are made of bone and cartilage (the same bendable stuff your ears are made of.) These are covered with thin plates called scutes. But the leatherback's shell is different.