Respuesta :

Biologists study life at all levels of organization and complexity:Atoms 
Genes 
Atoms 

Molecules 
Cells 
Tissues 
Organs 
Organisms 
Populations 
Communities 
Ecosystems 
Earth 
Solar Systems 
Galaxies 

They can also study specific things within those classifications, such as specific organs, the effects of pollution on ecosystems, etc.
by you thinking out your awnser to complex fractions you will get part of you ratios or the awnser to your ratios