<span>B. millions of years hope this helps</span>
<span>Peripheral thermoreceptors and central thermoreceptors</span>
Answer: infrared radiation
Explanation:
C. A Jellyfish isn't an example of an echinoderm.
**Sea urchins and starfish are echinoderms.**
If the choices are A.C2H6, B.C2H4, OR C.C2H2 then the answer would be B.C2H4 because each carbon atom bonds with two hydrogen atoms and one double carbon bond.