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The category above species is genus. Species are grouped together based on shared characteristics into genera. Genera are then grouped together into families, which is the next category in the biological classification hierarchy.
The next-higher level is the domain. The next-lower level is the phylum; for plants, this is traditionally called division.
Multiply by 10
Yes, Hurricane Rita followed Katrina in 2005 and reached Category 5 status at one point, making it a very powerful storm. Rita affected areas in Louisiana and Texas, causing significant damage and further strain on resources and infrastructure already impacted by Katrina.
Only about ten percent of energy is transferred from one trophic level to the next in an ecosystem. This is why the amount of animals in higher levels is smaller.