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

Which nucleotide component contains nitrogen

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions