The best and most correct answer among the choices provided by your question is The best and most correct answer among the choices provided by your question is the last choice.
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Kingdom Protista is not valid under evolutionary classification because they evolved before any other kingdom, and as such share a most recent common ancestor with each other, as opposed to any other group.</span>
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It must be based on scientific observations that can be repeated in a controlled setting, would be the correct answer.
<span>When a clot forms elsewhere, breaks free, then lodges in the brain, it is called an embolic stroke. It is also called an ischemic stroke. When the clot lodges in the brain, it causes a stroke which is what happens when blood flow to the brain is reduced or cut off. Sometimes the clot can form in the aorta, which is the largest artery in the body.</span>