Many of the first prokaryotes to be cultured in a scientific lab were human or animal pathogens. why would these species be more readily cultured than non-pathogenic prokaryotes?
pathogenic prokaryotes are hardier than non-pathogenic prokaryotes.
non-pathogenic prokaryotes require more supplements in their growth media.
most of the necessary culture conditions could be inferred for pathogenic prokaryotes.
pathogenic bacteria can grow as free bacteria, but non-pathogenic bacteria only grow as parts of large colonies.

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i don't understand

explanation:

i don't understand your question

answer australia and antarctica;

reflection is the bouncing back of a propagating wave when it encounters a barrier; usually shows an image of the source of light wave

1) bounces back from an opaque material

2) bounces back from the boundary

3) seen in mirrors

refraction is the bending of a propagating wave having a shift of direction as it passes through different media; usually seen in lenses to magnify or lessen

1) passes through a prism

2) moves from one medium to another

3) seen in lenses