Explain how complex fractions can be used to solve problems involving ratios

By you thinking out your awnser to complex fractions you will get part of you ratios or the awnser to your ratios

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.