Introduction

class="introduction"

class="summary" title="Sections Summary"

class="art-exercise" title="Art Connections

class="multiple-choice" title="Multiple Choice"

class="free-response" title="Free Response"

This photo shows a sage thrasher eating a berry.

No matter how complex or advanced a machine, such as the latest cellular phone, the device cannot function without energy. Living things, similar to machines, have many complex components; they too cannot do anything without energy, which is why humans and all other organisms must “eat” in some form or another. That may be common knowledge, but how many people realize that every bite of every meal ingested depends on the process of photosynthesis?

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