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
The answer is C)
Backflow prévention device
Answer:
B.
Explanation:
some scientists estimate that chlamydia is responsible for as many as one in five cases of infertility in women. However, chlamydia does not only affect female fertility, it can also take a toll on male fertility
