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Closing your eyes is voluntary.
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Answer: <u>The spine</u>
Explanation:
In the study of animal anatomy,a landmark is a major point on the body that has biological significance. An anatomical landmark is a biologically-meaningful point in an organism.;these landmarks are used for the definition of corresponding anatomical points within species.
Posterior, describes a region that is at the back of the body.
The answer for this question would be choice <span>B) Water, rock, and surface materials, or the second option.</span>
Complex organisms need cells that can perform many different functions. they need to be supported on a cellular level. Without specialized cells you they won't be able to perform different functions.