Answer:
Some vaccines contain whole bacteria or viruses. In these cases the bacteria or viruses will either be severely weakened (attenuated) so that they cannot cause disease in healthy people, or killed altogether (inactivated). Many vaccines contain only parts of viruses or bacteria, usually proteins or sugars from the surface. These stimulate the immune system but cannot cause disease
Explanation:
George is running a 5-km race and his cells need more oxygen. The change that will help his body meet the increased demand for oxygen is his heart will start beating more quickly. This helps the oxygen get ferried throughout the system faster. The correct answer is A.
Continue alternating five back blows and five chest thrusts until the object is forced out or the baby starts to cough forcefully, cry, breathe, or becomes unresponsive. If he's coughing, let him try to cough up the object.
Answer:
brainstem
Explanation:
Hope this helps, have a nice day, and good luck on your science quiz :) Hope you pass!!
