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g100num [7]
3 years ago
9

How did the evolution of photosynthetic prokaryotes affect the level of oxygen in the atmosphere?

Biology
1 answer:
Brut [27]3 years ago
4 0

Answer: effects of the evolution of photosynthesis. Photosynthetic organisms dramatically increased atmospheric oxygen levels between 2 and 2.5 billion years ago. This change created selective pressure favoring organisms that used oxygen to produce energy-containing molecules.

change the wording a little bit.

Explanation:

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What best explains why there's fewer secondary consumers than producers?
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because of inefficiency

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The organisms that eat the primary consumers are meat eaters (carnivores) and are called the secondary consumers. ... Because of this inefficiency, there is only enough food for a few top level consumers, but there is lots of food for herbivores lower down on the food chain. There are fewer consumers than producers.

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How is it possible that over 20 million living organisms on the planet are made up of only 5 types of nucleotide based arranged
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Imagine an organism exists that has only 2 nucleotides (<u><em>this is over 200,000x smaller than even the smallest bacterial genome</em></u>). If we allow any nucleotide at each of the 2 positions, then we have 4x4 (4²) or 16 possible combinations of sequences. For a nucleotide length of 4, the total number of possible combinations are 4⁴ or 256.

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