Answer:
Due to presence at early days of the planet.
Explanation:
We only find the remains of single celled organisms in the oldest fossils because the single celled organisms are the organisms that were present in the early days of this planet. These single celled microbes were present about 3.7 billion years ago while on the other hand, the oldest rocks are only a little older i. e. 3.8 billion years so these single celled organisms are considered as oldest fossils on this planet.
C. Protons and electrons must be equal as protons have a + charge and electrons are - so they cancel out
Sound intensity is the intensity/volume of sound. Frequency is how high or low the sound is.
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I think its option b, may carry out nitrogen fixation.
