What was the domain of the first life on earth? Was it unicellular or multicellular, prokaryotic or eukaryotic?

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Which must be kept in mind when determining if an explanation is correct? check all that apply.which must be kept in mind when determining if an explanation is correct? check all that apply.

The negative impacts of nonnative species generally outweigh the positive impacts