actually, they are fall in the category of analogous groups. as they do the same function but have different structure.
Quil is to porcupine as spine is to cactus
A spine.
'Spine' is another word for 'thorn'.
Spine
stem. if i am wrong please correct me
Only if the spine doesn't get stuck in their throat.
Skeletal System.
Lemurs, being animals who have developed notocords, that is, spine, belong to Phyllum Chordata.
Cactus spines act as a protective mechanism by deterring animals from feeding on the plant. They also help reduce water loss by providing shade and limiting air flow around the cactus. Additionally, some cactus spines are modified into hooks or barbs that aid in climbing or anchor the cactus in the soil.
Roundworms (scientific name: Nematoda) are invertebrates, as they do not have a spine.
It hurts but if the spine is carefully removed, it should cause nothing more than a bit of discomfort.
vertebrae make up the spine (backbone) of vertebrate animals.