The correct sequence of levels forming the structural hierarchy is: a. organ, organ system, cellular, chemical, tissue, organismal b. chemical, cellular, tissue, organismal, organ, organ system c. chemical, cellular, tissue, organ, organ system, organismal d. organismal, organ system, organ, tissue, cellular, chemical

Video transcript

Hi, everyone. Let's look at our next question, which of the following defines the organism level of body organization. Well, I think the easiest way here is we'll just look at all of our answer choices and talk through each one and decide on it as we look at it. So we're looking for this organism level. So that makes me think of the word organism. Uh We do want to distinguish that from organ. So it's not the organ level, it's the organism level. Choice A says it refers to the smallest units of life such as atoms and molecules. Well, that would be the atomic or molecular level of body organization and that is obviously not what we're talking about here. So not our answer. Choice. Choice B says it refers to a group of cells that work together to perform a specific function. In that case, we would be talking about the cellular level of organization, not the organism. So not choice B choice C says it refers to a group of organs that work together to perform a specific function. Well, that would be the organ level. So that is the one tricky one as organism might make us think of organ, but we're talking about organism versus organ. So not choice C. So we're left with choice D it refers to the entire organism made up of all the body systems, organs and tissues working together to maintain homeostasis. And that would indeed be our answer talking about how everything in the body works together to maintain the homeostasis of the entire organism. So that's why choice D refers to the entire organism is our correct answer here. See you in the next video.