NGSS
4-LS1-2
2 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 4 Science · Chapter 4 · Lesson 2
The eye takes in. It never gives out.
Grade 4 Science · Chapter 4 · Lesson 3
From Sense to Brain to Response
There is a step in the middle you forgot.