Prokaryotes were the first organisms to evolve on Earth, so, the first prokaryotic cells appeared 3.8 billion years ago. After them, Eukaryotic unicellular organisms developed, when one cell engulfed the other cell (endosymbiotic theory). Those unicellular eukaryotes form multicellular aggregates and that represents an evolutionary transition from single cells to multicellular organisms. Multicellular organisms evolved from unicellular eukaryotes at least 1.7 billion years ago.
<span>About
2 billion years passed between the appearance of the first prokaryotic cells and the emergence of multicellular organisms.</span>
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The answer would be Brown eyes as none of the other choices are traits.
There are no peptide bonds in nucleic acids...that’s only in proteins.
Best Answer: B. The number of stomata is more on the lower surface of the leaf - is true for dicots.<span>
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Answer:
Liver
Explanation:
Organisms that cannot easily and safely remove nitrogen as ammonia convert it to a less toxic substance, such as urea, via the urea cycle, which occurs mainly in the liver. Urea produced by the liver is then released into the bloodstream, where it travels to the kidneys and is ultimately excreted in urine.