It is an example of science
Orgainsm. This is the only word that makes sense. The statement is already talking about interrelated systems, so system wouldn't be the answer.
Tissue and Organ do not define a functional plant or animal either.
I hope this helps!
A decrease in strawberry productivity
The answer is here:
https://quizlet.com/13402266/biology-test-sterngrr-scientific-method-flash-cards/
<span>The state in which all body systems are functioning smoothly and in equilibrium is homeostasis.</span>