2. Humans have an appendix, a thin tube connected to the large intestine that serves no purpose and is a threat to human health and life if it becomes infected and/or inflamed. It is believed that the appendix
once had a function as part of the human digestive system. The human appendix, therefore, is

A Vestigial Structure

Explanation: A structure that was once used by ancestors, and now serves no purpose at all

answer; /// i believe that the correct answer is (50%);

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.