18. Sponges are filter-feeders. Which structure enables this function? (A) Amoebocytes (B) Choanocytes (C) Spicules (D) Spongecoel

10. Coagulation is a delicate mechanism controlling clot formation and preventing blood drainage. What kind of dietary deficiency and clotting factor deficiency would lead to defective blood clotting and hemophilia A? (A) vitamin E; factor VIII (B) vitamin B12; factor VIII (C) vitamin E; von Willebrand factor (D) vitamin B12; von Willebrand factor (E) vitamin K; factor VIII

18. Sponges are filter-feeders. Which structure enables this function?
(A) Amoebocytes
(B) Choanocytes
(C) Spicules
(D) Spongecoel

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