What are viruses made of?

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<blockquote class="wp-embedded-content" data-secret="SC5Y9TGR8q"><a href="https://rockedu.rockefeller.edu/component/what-are-viruses-made-of/">What are viruses made of?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://rockedu.rockefeller.edu/component/what-are-viruses-made-of/embed/#?secret=SC5Y9TGR8q" width="600" height="400" title="&#8220;What are viruses made of?&#8221; &#8212; RockEDU" data-secret="SC5Y9TGR8q" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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