The Main Idea Is: Robotic cockroaches can be very useful
Explanation:
Incase you don't know what a main idea is, a main idea is a sentence that provides the subject for discussion; it is the topic sentence. It is usually supported by a list of details. If you can tell what the supporting details have in common, you can discover the main idea.Example: great heat of the desert sun at noon and in the bitter cold of the desert at night.
