The correct answer would be D) An observation that has a number associated with it.
75% species go extinct to be considered a mass extinction
Sugars link together by phosphates to create the backbone of the DNA or RNA molecule. Genetic information is carried and stored in the sequence of nucleic acid bases along a chain of DNA or RNA. When cells duplicate inside of the human body, DNA is replicated through RNA in order to give the new cell a new set of DNA.
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One very common function of an antenna of an arthropod would be for sensory. It is used by these organisms mainly for touch. Also, other uses would be sensing the motion of air, heat, sound and as well as taste and smell.
