For the eighth observation (i = 8), identify the animal phylum, xi, and yi.
a)phylum Cephalochordata;xi= 33; yi= 68
b)phylum Urochordata;xi= 77; yi= 25
c)phylum Porifera;xi= 5.8; yi= 25
d)phylum Urochordata;xi= 25; yi= 77