The transfer of antibodies from a mother to the fetus. This occurs naturally, and since it is the transfer of antibodies, it is passive immunity.
False,your respiratory muscle expand each time when you exhale.
You're gonna have to give us a picture to support your question..
Birds and butterflies don't have a common ancestor because one is a member of a insect and the other is well a bird. They both have different body structure. One has bones and the other has an exoskeleton. hope this helps
Answer:
plants
Explanation:
all green life gives us oxygen, and in turn we give c02 or carbon dioxide
