Would it be physically possible for an animal to extract iron from blood to sharpen its teeth? I had an idea for a semi-aquatic animal that can use the iron in the blood of its victims to make its teeth sharper, so I want to check if this would be actually possible.
There are some animals, such as mosquitoes and ticks, that extract iron from blood to use for their own biological processes. However, these animals have specialized adaptations for this purpose, such as specialized enzymes and proteins that allow them to extract and utilize the iron efficiently.
It is unlikely that a larger animal, like the one you are describing, would be able to extract enough iron from the blood of its victims to significantly sharpen its teeth. Additionally, the process of extracting iron from blood would require complex and energy-intensive metabolic pathways that may not be feasible for a larger animal.
While the idea of a semi-aquatic animal using iron from blood to sharpen its teeth is an interesting concept, it may not be biologically realistic. You may want to consider alternative ways in which the animal could sharpen its teeth, such as through hunting and chewing on hard objects.