★ Polio Quiz
Who did Jonas test his vaccine on first
A. His pets
B. Random people
C. Himself
D. His family
Select your answer:

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Oncology › ViewWhen the cancer cells spread to distant parts of the body, it is called …
A. invasion
B. metastasis
C. remission
Circulatory and Respiratory System › View
Your alveoli and capillaries work together to __________________.
A. produce mucus
B. transport oxygen into your lungs and carbon dioxide into yoru blood.
C. transport carbon dioxide into your lungs and oxygen into your blood.
D. help you breathe