The idea of molecular clock genes has been studied for decades, but the hypothesis remains a controversial topic in evolutionary biology. Why do you think that is the case? What are three questions you still have about the use of molecular clocks?

What problems are there using molecular clocks?

Are molecular clocks accurate?

How do you use a molecular clock?

Explanation:

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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