Which sequence correctly shows increasing complexity of body organisation in animals?
ATissue level $\rightarrow$ cellular level $\rightarrow$ organ level $\rightarrow$ organ-system level
BCellular level $\rightarrow$ tissue level $\rightarrow$ organ level $\rightarrow$ organ-system level
CCellular level $\rightarrow$ organ level $\rightarrow$ tissue level $\rightarrow$ organ-system level
DOrgan level $\rightarrow$ tissue level $\rightarrow$ cellular level $\rightarrow$ organ-system level
Answer & Solution
Correct answer: B. Cellular level $\rightarrow$ tissue level $\rightarrow$ organ level $\rightarrow$ organ-system level
Body organisation increases from cells alone to tissues, then organs, and finally organ systems. Thus the correct progression is cellular level $\rightarrow$ tissue level $\rightarrow$ organ level $\rightarrow$ organ-system level. The other options place these stages in the wrong developmental order.
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