Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Hematopoiesis occurs in bone
marrow (mainly flat bones),
where , leukocytes and
platelets made, and in lymphoid
tissue, responsible the maturation of
and found in thymus,
spleen and .