2.5 billion years
No. A prokaryote is a single cell.
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The evolution of single-celled organisms is estimated to have occurred around 3.5 billion years ago, while the evolution of multicellular organisms is believed to have started around 600 million years ago. This means there was a gap of about 2.9 billion years between the evolution of single-celled and multicellular organisms.
Sporozoan are unicellular organisms. It's classified into the Kingdom Protista, which are single-celled organisms.
Sexual reproduction evolved before the evolution of multicellularity. Organisms were able to reproduce sexually as single-celled organisms before multicellular life forms emerged.
single celled organisms
It took many years of evolution for complex, multi-celled organisms to develop. Single celled organisms were the first that were around to be fossilized.
It is the idea that living things adapt to their surroundings. Also, the theory of evolution states that all living beings evolved from single-cell organisms
Multicellular. A single celled organism is not visible with the naked eye.
Multicellular, only some forms of organism like Amoeba are single cellular and they are microscopic.
The same as it was when and after vertebrates. Evolution is the change in allele frequency over time in a population of organisms. Change over time. Happens and happened in single celled organisms and invertebrates long before there were vertebrates.
That depend on your religion. Some religions believe that people were. But if you go for evolution, then its single celled organisms.