The correct answer is: A. quill : porcupine
A frond is a leaf-like structure that grows on a palm tree. A quill is a sharp, pointed hair that grows on a porcupine. Both fronds and quills are used for protection. Fronds can be used to shade the palm tree from the sun, while quills
can be used to deter predators.The other options are not as similar to the original pair of words. A blade is a sharp, thin piece of metal or other material that is used for cutting. An evergreen is a plant that keeps its leaves all year round. A scale is a small, thin piece of hard material that covers the skin of some animals. A tusk is a long, pointed tooth that grows in some animals, such as elephants. A blade is not used for protection, an evergreen does not have sharp, pointed leaves, a scale does not grow on a wallaby, and a tusk does not grow on an alligator.