Tetrahymena, Stentor, and <span>Vorticella</span>
<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
Answer:
B
Explanation:
It directly enters the bloodstream and displaces oxygen in red blood cells.
The excretory system helps the body maintain homeostasis by excreting waste and the kidney regulates the water balance of our bodies.
Answer:
A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. A rock is an aggregate of one or more minerals, or a body of undifferentiated mineral matter.
Explanation:
