Question

question 13 of 25 which item represents the highest level of biological organization? a. blood cell b. nervous system c. heart d. muscle tissue

Explanation:

Biological organization levels range from cells to tissues, organs, organ - systems, and organisms. A blood cell is a cell. Muscle tissue is a tissue. The heart is an organ. The nervous system is an organ - system, which is a higher - level organization than the others listed.

Answer:

B. Nervous system