High concentration and passive transport
Answer: the fossil record, biogeography, comparative anatomy, comparative embryology, and molecular biology, Direct observation.
Explanation:
The signs and symptoms of a cluster headache include severe<span> right-sided headache with a runny nose, droopy eyelids, and tearing of the eye on the right side.
</span>The injectable form of sumatriptan<span> (</span>Imitrex<span>), which is commonly used to treat a migraine, is also an effective treatment for acute cluster headache</span>
Honestly it depends on what state so you have to look up if they are legal in your area
Hey! they are usually single celled!
hope this helped xoxo
