Question

question 4
10 points
which of the following organisms use osteoblasts and osteoclasts to reshape its skeleton?
a a cat
b octopuses
c annelids
d caterpillars

Explanation:

Osteoblasts (bone - forming cells) and osteoclasts (bone - resorbing cells) are associated with the remodeling of a bony skeleton.

• A cat has an endoskeleton made of bone, and bone remodeling (using osteoblasts and osteoclasts) occurs throughout its life (e.g., during growth, repair, and in response to mechanical stress).
• Octopuses have a soft body with no true bony skeleton. Their “skeleton” is more about hydrostatic support (from their body fluids) and some cartilaginous structures (not involving osteoblasts and osteoclasts for remodeling in the way a bony skeleton does).
• Annelids (like earthworms) have a hydrostatic skeleton (a fluid - filled coelom that provides support). There is no bony tissue, so no osteoblasts or osteoclasts for bone - related remodeling.
• Caterpillars have an exoskeleton (made of chitin). Chitin is a polysaccharide, not bone, and its growth and change (e.g., during molting) do not involve osteoblasts and osteoclasts.

Answer:

A. a cat