They are in the phylum Chordata meaning that they have spines.
A feeling of extreme nervousness.
Yes. They are vertebrates meaning that they are a species that have spines or 'backbones'.
Cacti have spines. Evolutionary theory is that the spines were originally leaves, but which reduced in size and form to carry out a new function, as spines, to protect the plant from predators. According to the same theory the stem of the plant became the gas exchange and the 'chlorophyll-containing' 'photosynthesis' part of the plant, thus replacing the functions formerly carried out by and through the leaves.
A squirrel belongs to the phylum Chordata, specifically in the class Mammalia.
No, raccoons do not have spines. Porcupines have spines.
Yes people have spines.
Elephants do have spines.
they have the spines to protect them from your face
All reptiles have spines.
Yes. All mammals have spines.
they have spines. spines are vertebrates they are not invertebrates.