<span>The choices can be found elsewhere and as follows:
</span><span>A) REM; Stage 1 B) Stage 1; REM C) REM; Stage 2 D) Stage 2; REM E) REM; Stage 4 </span><span> I believe the correct answer is option E. Paradoxical sleep is to slow-wave sleep as REM sleep is to stage 4 sleep. Hope this answers the question.</span>
1. The retina contains three kinds of colour receptors
Explanation:
Young-Helmholtz theory color vision says human can perceive colour due to the presence of colour receptors in the retina that receives colour in various wavelengths
