A, B, D, and E are all wrong. C is the right answer. C is a compound.
A, B, D and E are not unique. A pure substance is something with unique characteristics and if it can be broken down, the result is two or more pure substances. AKA only compounds and elements. This is an easy question so try to study.
That would be : adenine, thymine, guanine, and cytosine.
Hello There!
A broad, flat muscle of the lower back is called the <em>"Latissimus dorsi"</em>
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<u><em>The latissimus dorsi is a very large important muscle in the back. This muscle helps perform different kinds of movements involving the arms and the shoulders.</em></u>
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Answer: B
Like the nervous system, the endocrine system is a regulatory system. However, instead of using electrical impulses for signaling, it produces and uses chemical signals called hormones, which travel through the bloodstream and control the actions of cells and organs.