To obtain the energy needed for life processes, plants break down to release stored chemical energy through the process of

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

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d eras and periods

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.