At conception. When the sperm reaches the egg and fertilizes the oocyte and together they form a zygote, Which is live baby cells.
Answer:
Color – pure water is colorless; colored water can indicate pollution.
Turbidity – pure water is clear and does not absorb light.
Taste and odor – pure water is always tasteless and odorless.
Explanation:
I would think the answer is 15 smoke-free years.
1. spine and sacrum
2. atlas and axis
3. intervertebral discs
4. nucleus pulposus