Question

Fill in the blanks please.

12. The circulatory system has blood as its main fluid and the lymphatic system has ___________________ as its main fluid. 13. ________ cells form in the bone marrow. 14. ________ cells form in the thymus gland. 15. Antigens are any substance released by __________________________. 16. The immune system response to antigens by producing ________________.

Answer 1

Answer:

12. lymph

13.red blood cells

14. T cells

15.

16.antibodies

Answer 2

1)lymph
2)blood
3)T cell
4)immune system
5)antibodie