Answer:
Yellow fever virus is transmitted to people primarily through the bite of infected Aedes or Haemagogus species mosquitoes.
Explanation:
I'm not sure if this helps but I think that oxygen moves into and carbon dioxide leaves it.
Answer:
Yes hemoglobin is a natural chemical that is used in our blood
Explanation:
Operant conditioning, also known as instrumental conditioning, is a method of learning normally attributed to B.F. Skinner, where the consequences of a response determine the probability of it being repeated. Through operant conditioning behavior which is reinforced (rewarded) will likely be repeated, and behavior which is punished will occur less frequently.
