In an animal, which of the following structures represents the highest level of organization? a. heart b. mitochondrion c. red blood cell d. epidermis tissue

In an animal the structure of the Heart and the Red blood cells are the most important. When it all comes down to which is the most important, its the organization of the Heart.

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characteristics of hydrocarbons

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.