What energy source's harmful effects did the development of the ozone layer protect early organic life from? 

A)  x-rays 
B)  ultraviolet radiation 
C)  radioactivity 
D)  lightning

Ultraviolet Radiation

A form of electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays, capable of causing skin burns and can play a beneficial role in vitamin D production.

Ozone Layer

The ozone layer is a stratospheric layer rich in ozone, which protects life on Earth by absorbing the majority of the sun's harmful ultraviolet radiation.

Organic Life

Refers to life forms that are based on carbon compounds, which includes all living organisms on Earth.