glucose is been oxidised to produce pyruvic acid and oxygen
There was no life on Earth for the first billion years because the atmosphere was not suitable for life. Earth's first atmosphere had lots of water vapor but had almost no oxygen. Later, frequent volcanic eruptions put several different gases into the air.
Prokaryotes. they are the oldest living organisms
Answer:
The World Ocean
Explanation:
The World Ocean is the largest existing ecosystem on our planet. Covering over 71% of the Earth's surface, it's a source of livelihood for over 3 billion people.
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<em><u>^Hope this helps, Hazel^</u></em></h2>
there is less energy on the 5th level, the less the energy, the smaller the food chain
