What do red blood cells, white blood cells, and platelets have in common?
a. all are part of lymph
b. all are produced in the bone morrow
c. all are involved in destroying pathogens
d. all are self-secreting hormones

Explanation:

Platelets are thrombocytes, whose function is to help blood clots form at the site of an injury; red blood cells are erythrocytes, whose function is to carry oxygen to body cells.

I think it is B) All are produced in the bone marrow

Explanation:

I may be wrong but there is the answer I put on my test. Hope you have a good day

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