it is believed that the earth had no livingisms until a comet hit the earth with orgamisms on it.
Yes, they do.
All living organisms have to have a host to create other organisms. This includes micro organisms as well as bacterial organisms
Yes, they do.
Mold.
This concept is known as biogenesis, which states that living organisms only arise from pre-existing living organisms.
it's called biogenesis
Ultimately, it all comes from the Sun.
Birds and Mammals come to mind . . .
There are no non-living organisms, unless you mean dead organisms.
The cell is considered the smallest living unit of all living things. It is the basic structural and functional unit of living organisms. Cells can work individually or come together to form tissues, organs, and entire organisms.
All living things are organisms. There is no such thing as a living cell that is not an organism.
Abiogenesis is the scientific theory that life can arise from non-living matter, while biogenesis is the theory that living organisms can only come from other living organisms. Abiogenesis is concerned with how life originated on Earth, while biogenesis explains the reproduction and growth of living organisms.