D. Man-Made is the answer
It would be commensalism- a symbiotic relationship where one organism benefits while the other remains unaffected.
Mitochondria, plastids and chloroplast all are surrounded by a double membrane
Answer:
Executive
Explanation:
having the power to put plans, actions, or laws into effect.
Cells are the basic unit of life and they are the 1st level of organization. The heart is the 3rd level. They are separated by 1 level, tissues.