Because when you start talking about your topic,you use to divide it,since it has to do with the 'topic',you don't use a period.
It’s a method using lines to create the illusion of space on a 2D surface.
Answer:
3)cones but not rods
Explanation:
Cones help in color vision
Rods help in light vision
Answer : D) not
Antonyms are words used to show the opposite meaning of another word, and the word “not” is often placed in front of another to show this.