Answer:
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
Answer: chemical digestion: The process of enzymes breaking down food into small molecules the body can use.
Explanation:
A- controlling
B- plays victim
C-critical
D-abusive