Which structure is part of the circulatory system?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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Need asap plz hurry im being timed when a body cell divides through the process of mitosis, the chromosomes in the daughter cells a. represent only the healthiest chromosomes from the parent cell. b. represent only half of the chromosomes in the parent cell. c. are identical to the chromosomes of the parent cell. d. are formed when chromosomes from the parent cell cross over.