Chemistry, 25.01.2021 20:40, juanitarodrigue

All organisms have a barrier that separates their internal environment from the outside world. Which of the following organ systems forms a barrier between the internal and external environments for humans? A. excretory system
B. integumentary system
C. circulatory system
D. nervous system

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All organisms have a barrier that separates their internal environment from the outside world. Which...