Humans belong to the D) chordates group
Answer:
A: white blood cells are growing uncontrollably
Explanation:
Answer:
Oral poliovirus vaccine or Sabin vaccine, named for its inventor American physician and microbiologist Albert Sabin, was developed. OPV contains live attenuated (weakened) virus and is given orally.
Blood flow goes from the heart, to the lungs, and back to the heart again.