Are we alone?
We just don't know. There are trillions of exoplanets in the universe and it will be extraordinary if we are alone. Extraterrestrials (E.T.s) or just aliens (only if there are) can be microbial or intelligent.
Recipe for Life
Living organisms contain relatively large amounts of oxygen, carbon,hydrogen, nitrogen, and sulfur (these five elements are known as the bulk elements), along with sodium,magnesium, pota-ssium, calcium, chlorine, and phosphorus (these six elements are known as macrominerals).Source: https://chem.libretexts.org/Textbook_Maps/General_Chemistry_Textbook_Maps/Map%3A_Chemistry_(Averill_and_Eldredge)/01%3A_Introduction_to_Chemistry/1.8_Essential_Elements_for_Life
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