1. Which is not found in cartilage but is found in bone? \( \begin{array}{lll}\text { a. live cells } & \text { b. lacunae } & \text { c. blood vessels }\end{array} \) d. organic fibers

Cartilage is known for being more flexible and having a lower density than bone, which is why it lacks blood vessels. Instead, cartilage relies on diffusion to get nutrients. Bones, on the other hand, are robust structures that require a direct blood supply to support their metabolism and repair processes. When it comes to live cells, both cartilage and bone contain them, but the type of cells differs. Bone contains osteocytes, which are embedded in the bone matrix, while cartilage has chondrocytes. So, in short, blood vessels are a distinctive feature of bone, fundamentally supporting its function!