Hieroglyphics is how they communicated but not really. It was used as symbolism i guess you could say. Have you seen those movies where you see all the ancient art on the inside of caves?? That's basically what it was in Egypt except it was used as art
A clinical trail
Clinical trials are research studies that explore whether a medical strategy, treatment, or device is safe and effective for humans. These studies also may show which medical approaches work best for certain illnesses or groups of people. - Definition by <span>https://www.nhlbi.nih.gov/studies/clinicaltrials</span>
Answer: B
Explanation: In relation to the water difference.
