Bacteria cells, I believe so.
Explanation:
In all living system we can always find basic elements carbon, oxygen, nitrogen and hydrogen, carbon is the basic building unit contained in living matter. The percentage of carbon in the mass of living matter is 19.0% oxygen and hydrogen are present in almost all organic compound which creates living organisms.
The answer is sedimentary rock.
Answer: "sexual" ; in the sense that they reproduce "sexually" —and NOT asexually.
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