I believe it D because they have to have data , they also guess and really they also have opinions
Answer and Explanation:
The lymph node are the sites for the formation of lymphocytes and monocytes. These are concerned with antibody formation and phagocytosis of foreign materials respectively. In the lymph nodes, bacteria and other harmful materials are removed from lymph.
It changed as more food more games less sleep
B. long fibres in celery
(I've done an experiment in my science class once on xylem tissue on celery)
