D. single- and simple multi-celled organisms
Although more complex animals like invertebrates and multi-celled organisms began to appear, it was very late compared to the original, simpler organisms for which the Precambrian time is characterized by.
Hi. "Tidal wave" suggests a wave associated with the ebbs and flows related to the relative positions of the earth, moon and sun. These rises and falls relative to mean sea level are periodic and easily predictable. But the enormous wave generated by an earthquake is probably even less easy to predict than an earthquake and of no regular (that is, periodic) recurrence that anyone knows of. But I think "tsunami" is not too bad a name for such earthquake-generated waves as tsunami does not suggest any strong link with the relative positions of the earth, moon and sun.
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Answer:
The Greeks had to raise crops and animals suited to the hilly environment and the climate of hot, dry summers and wet winters. Their crops were wheat, barley, olives and grapes.
Fossil fuel is a natural fuel such as coal or gas , formed in the past from the remains of living organisms e.g. : dead trees , plants, marine animals
They are significant so we can use them today for oil
