Researchers are developing coding systems that enable them to objectively read animal facial expressions rather than inferring or guessing at their meaning. A coding system precisely describes how different facial features change when an animal feels a particular emotion, such as squinting an eye or pursing lips.
The reason is because the sky overcast system is to go into the sky and try to figure out the wheater which would be a dependent clause in this situation please let my know if im wrong :) hope it helps
