During what eon did visible life start to appear and resulted in abundant fossils?

W) Hadean

X) Archaean

Y) Proterozoic

Z) Phanerozoic
Z) PHANEROZOIC15) Math - Multiple ChoiceWhich of the following best describes the relationship between the lines with equations \(\frac{5x+7y=35}{\rm\ and\ \ }\frac{28x-20y=35}{\rm?}\)