Oxygen.
Oxygen was fatal when organisms started using photosynthesis, this event was known as the Great Oxidation Event.
Answer:
can you expand on that it not clear what you want
Plants have the fewest similarities with the other two groups of organisms.
<h3>Plants vs animals</h3>
Plants generally comprise all living organisms that have chlorophyll and are able to manufacture their own foods by photosynthesis.
Animals, on the other hand, are living organisms that cannot manufacture their foods and are mobile. Animals are either vertebrates or invertebrates.
Plants qualify as living organisms because they are able to feed, excrete, reproduce, grow, respond to stimuli, die, and carry out other basic characteristics of living organisms.
More on plants and animals can be found here: brainly.com/question/5018082
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