D neither a nor b is right
Answer: the antigens identify the foreign invader
The correct answer is A, perform a cesarean section, sometimes called a c-section. It isn’t B because she’s almost due, therefore it’s probably too late to terminate the pregnancy. It isnt C because the birth canal is a natural birth, and it isn’t D- if the mom had HIV, blood transfusions may be required.
Our lung capacity naturally starts to decrease at the age of 30. By the time we reach 50, it could be decreased by half. I'm not sure about when we reach 90 though. Hope this helps! :)