The answer would be ecosystem.
- I hope this helps! (:
<h2>Operational </h2>
Explanation:
The operational definition is the description of a specific process, or set of validation tests, accessible to more persons than the definer (i.e., said to be publicly accessible), where it can be repeatedly measured or tested
Operational definitions are also used to define system states or (nonspecific) physical objects by the description of a specific process of preparation which can be repeated
For example in the given example experimenter is using the case of hitting a punching bag to measure the level of aggression in someone
They are composed of proteins. I cannot see the options but hopefully that answer is in one of them
A semipermeable membrane is any biological or synthetic membrane that allows certain molecules or ions to pass through while restricting others.
