Answer:
Explanation:
I guess they all have a silicon and oxygen compound in each formula
The four main parts are:
Heart
Blood vessels
Blood
Lymphatic system
Hope that helps <span>
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C. The vestigial structures. <span>A </span>vestigial structure<span> is an anatomical feature that no longer seems to have a purpose in the current form of an organism of the given species. Often, these vestigial structures were organs that performed some important function in the organism at one point in the past. However, as the population changed due to</span>natural selection<span>, those structures became less and less necessary until they were rendered pretty much useless. While most of these types of structures would probably disappear over many generations, some seem to keep being passed down to offspring even though they have no known function.</span>
