What is an extremophile? give an example

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

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false