An advantage of the syringe method is that blood appears in the hub when the vein has been entered.
I believe the correct answer is B: The prevention of second-hand smoke. Hope this helped!
-TTL
Flat good luck wooooooooo
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
They have developed a plan to hang poster and hand out fliers door to door.
