What is the organ system that forms blood cells?
A) endocrine
B) skeletal
C) cardiovascular
D) integumentary
B
Explanation:
A) The endocrine system directs long-term changes in the activities of other organ systems.
C) The cardiovascular system distributes blood cells, water and dissolved materials including nutrients, waste products, oxygen, and carbon dioxide.
D) The integumentary system protects against environmental hazards.
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