The answer is C , resistance to extinction
Answer:
Answer: A. Neutrophils gather at the site of infection and release histamin,
while macrophages ingest antigens before they enter the bloodstream.
Explanation:
Neutrophils are specialized white blood cells which are capable of fighting
against the infections. Neutrophils are required at the site of injury and
produces histamin to fight against inflamation. Whereas the macrophages
are type of monocytes that ingest foreign antigens or bodies like bacteria
and virus which could enter the bloodstream and cause disease oriented
symptoms.
Explanation:
Correct me if I'm wrong
Yolk sac during first 7 weeks
placenta from 8 weeks till birth
