Which worm phylum is being described ?

A nervous system consisting of a nerve net in the head and two nerve cords running the length of the body. Some members have light-sensitive eyespots

A. Platyhelminthes

B. Nematoda

C. Annelida

D. Arthropoda

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.

answer; endoplasmic reticulum;